Compressed-Air Breakdown Diagnostics, Fault Triage & Recovery Engineering

COMPRESSED-AIR BREAKDOWN DIAGNOSTICS, FAULT TRIAGE & RECOVERY ENGINEERING

It also requires diagnostic conclusions to state evidence, tests and unresolved uncertainty. These controls are expanded here without inventing diagnosis-time or first-time-fix guarantees.

Provisional new-series slug: /compressed-air-engineering/breakdown-diagnostics-fault-triage-recovery/ | CTA: Diagnose My Compressor Breakdown

The first job in a breakdown is not to reset the alarm. it is to make the condition safe and preserve the evidence that explains why the machine stopped

The objective is safe restoration of required service while preserving fault chronology, distinguishing symptoms from mechanisms, testing competing causes and verifying that corrective work actually restored the compressor system.

A compressor trip can originate outside the compressor. Supply voltage, cooling water, room ventilation, downstream pressure, blocked treatment, closed valves, failed drains, sequencing, sensor error or process demand can create package symptoms. The diagnostic boundary therefore expands from the alarmed component to the complete compressed-air utility when evidence requires it.

1 — Asset Identity

Breakdown Triage Foundation: govern asset identity as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

2 — Breakdown Timestamp

Breakdown Triage Foundation: govern breakdown timestamp as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

3 — Operating State

Breakdown Triage Foundation: govern operating state as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

4 — Production Consequence

Breakdown Triage Foundation: govern production consequence as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

5 — Criticality

Breakdown Triage Foundation: govern criticality as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

6 — Safety Condition

Breakdown Triage Foundation: govern safety condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

7 — Fault Code

Breakdown Triage Foundation: govern fault code as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

8 — Alarm Chronology

Breakdown Triage Foundation: govern alarm chronology as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

9 — Operator Observation

Breakdown Triage Foundation: govern operator observation as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

10 — Recent Maintenance

Breakdown Triage Foundation: govern recent maintenance as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

11 — Recent Configuration Change

Breakdown Triage Foundation: govern recent configuration change as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

12 — Recent Process Change

Breakdown Triage Foundation: govern recent process change as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

13 — Environmental Condition

Breakdown Triage Foundation: govern environmental condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

14 — Diagnostic Owner

Breakdown Triage Foundation: govern diagnostic owner as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

15 — Revision Control

Breakdown Triage Foundation: govern revision control as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

16 — Abnormal Noise

Stabilise & Make Safe: govern abnormal noise as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

17 — Abnormal Heat

Stabilise & Make Safe: govern abnormal heat as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

18 — Air Leak

Stabilise & Make Safe: govern air leak as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

19 — Oil/Fluid Leak

Stabilise & Make Safe: govern oil/fluid leak as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

20 — Electrical Smell/Smoke Boundary

Stabilise & Make Safe: govern electrical smell/smoke boundary as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

21 — Pressure Hazard

Stabilise & Make Safe: govern pressure hazard as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

22 — Stored Pressure

Stabilise & Make Safe: govern stored pressure as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

23 — Rotating Hazard

Stabilise & Make Safe: govern rotating hazard as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

24 — Hot Surface

Stabilise & Make Safe: govern hot surface as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

25 — Cooling-Water Leak

Stabilise & Make Safe: govern cooling-water leak as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

26 — Structural Damage

Stabilise & Make Safe: govern structural damage as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

27 — Remote-Start Risk

Stabilise & Make Safe: govern remote-start risk as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

28 — Isolation Need

Stabilise & Make Safe: govern isolation need as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

29 — Secondary-Damage Risk

Stabilise & Make Safe: govern secondary-damage risk as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

30 — Safe-State Confirmation

Stabilise & Make Safe: govern safe-state confirmation as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

31 — Controller Fault History

Evidence Preservation: govern controller fault history as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

32 — Vsd Fault History

Evidence Preservation: govern VSD fault history as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

33 — Sequencer History

Evidence Preservation: govern sequencer history as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

34 — Event Timestamp

Evidence Preservation: govern event timestamp as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

35 — Pressure Trend

Evidence Preservation: govern pressure trend as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

36 — Temperature Trend

Evidence Preservation: govern temperature trend as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

37 — Current/Power Trend

Evidence Preservation: govern current/power trend as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

38 — Speed/Load Trend

Evidence Preservation: govern speed/load trend as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

39 — Oil Level

Evidence Preservation: govern oil level as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

40 — Oil Condition

Evidence Preservation: govern oil condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

41 — Vibration Evidence

Evidence Preservation: govern vibration evidence as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

42 — Photos/Video

Evidence Preservation: govern photos/video as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

43 — Failed-Part Condition

Evidence Preservation: govern failed-part condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

44 — Operator Statement

Evidence Preservation: govern operator statement as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

45 — Data Export

Evidence Preservation: govern data export as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

46 — Incoming Voltage

Power & Electrical Fault Chain: govern incoming voltage as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

47 — Phase Condition

Power & Electrical Fault Chain: govern phase condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

48 — Protection Trip

Power & Electrical Fault Chain: govern protection trip as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

49 — Fuse/Breaker Boundary

Power & Electrical Fault Chain: govern fuse/breaker boundary as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

50 — Starter/Contactor

Power & Electrical Fault Chain: govern starter/contactor as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

51 — Vsd Input

Power & Electrical Fault Chain: govern VSD input as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

52 — Vsd Fault

Power & Electrical Fault Chain: govern VSD fault as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

53 — Motor Current

Power & Electrical Fault Chain: govern motor current as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

54 — Motor Temperature

Power & Electrical Fault Chain: govern motor temperature as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

55 — Motor Insulation Boundary

Power & Electrical Fault Chain: govern motor insulation boundary as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

56 — Terminal Condition

Power & Electrical Fault Chain: govern terminal condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

57 — Control Power

Power & Electrical Fault Chain: govern control power as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

58 — Earthing Boundary

Power & Electrical Fault Chain: govern earthing boundary as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

59 — Generator Supply Boundary

Power & Electrical Fault Chain: govern generator supply boundary as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

60 — Electrical Specialist Escalation

Power & Electrical Fault Chain: govern electrical specialist escalation as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

61 — Controller State

Controls & Instrument Fault Chain: govern controller state as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

62 — Pressure Sensor

Controls & Instrument Fault Chain: govern pressure sensor as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

63 — Temperature Sensor

Controls & Instrument Fault Chain: govern temperature sensor as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

64 — Flow Sensor Boundary

Controls & Instrument Fault Chain: govern flow sensor boundary as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

65 — Dp Sensor

Controls & Instrument Fault Chain: govern DP sensor as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

66 — Dew-Point Sensor

Controls & Instrument Fault Chain: govern dew-point sensor as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

67 — I/O State

Controls & Instrument Fault Chain: govern I/O state as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

68 — Interlock

Controls & Instrument Fault Chain: govern interlock as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

69 — Permissive

Controls & Instrument Fault Chain: govern permissive as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

70 — Local/Remote Mode

Controls & Instrument Fault Chain: govern local/remote mode as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

71 — Setpoint

Controls & Instrument Fault Chain: govern setpoint as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

72 — Configuration

Controls & Instrument Fault Chain: govern configuration as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

73 — Communication Link

Controls & Instrument Fault Chain: govern communication link as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

74 — Stale/Bad Data

Controls & Instrument Fault Chain: govern stale/bad data as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

75 — Sensor Plausibility

Controls & Instrument Fault Chain: govern sensor plausibility as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

76 — Ambient Temperature

Cooling & Thermal Fault Chain: govern ambient temperature as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

77 — Intake Temperature

Cooling & Thermal Fault Chain: govern intake temperature as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

78 — Room Ventilation

Cooling & Thermal Fault Chain: govern room ventilation as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

79 — Recirculation

Cooling & Thermal Fault Chain: govern recirculation as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

80 — Cooler Condition

Cooling & Thermal Fault Chain: govern cooler condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

81 — Fan Condition

Cooling & Thermal Fault Chain: govern fan condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

82 — Cooling-Water Flow

Cooling & Thermal Fault Chain: govern cooling-water flow as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

83 — Cooling-Water Temperature

Cooling & Thermal Fault Chain: govern cooling-water temperature as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

84 — Thermostatic/Bypass Boundary

Cooling & Thermal Fault Chain: govern thermostatic/bypass boundary as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

85 — Lubricant/Coolant Level

Cooling & Thermal Fault Chain: govern lubricant/coolant level as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

86 — Filter Restriction

Cooling & Thermal Fault Chain: govern filter restriction as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

87 — High-Pressure Duty

Cooling & Thermal Fault Chain: govern high-pressure duty as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

88 — Thermal Sensor

Cooling & Thermal Fault Chain: govern thermal sensor as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

89 — Temperature Trend

Cooling & Thermal Fault Chain: govern temperature trend as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

91 — Lubricant Identity

Lubrication & Separation Fault Chain: govern lubricant identity as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

92 — Oil Level

Lubrication & Separation Fault Chain: govern oil level as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

93 — Oil Pressure Boundary

Lubrication & Separation Fault Chain: govern oil pressure boundary as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

94 — Oil-Filter Condition

Lubrication & Separation Fault Chain: govern oil-filter condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

95 — Fluid Degradation

Lubrication & Separation Fault Chain: govern fluid degradation as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

96 — Water Contamination

Lubrication & Separation Fault Chain: govern water contamination as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

97 — Separator Dp

Lubrication & Separation Fault Chain: govern separator DP as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

98 — Oil Carryover

Lubrication & Separation Fault Chain: govern oil carryover as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

99 — Scavenge Line

Lubrication & Separation Fault Chain: govern scavenge line as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

100 — Minimum-Pressure Valve

Lubrication & Separation Fault Chain: govern minimum-pressure valve as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

101 — Foaming

Lubrication & Separation Fault Chain: govern foaming as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

102 — Leakage

Lubrication & Separation Fault Chain: govern leakage as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

103 — Oil-Analysis Evidence

Lubrication & Separation Fault Chain: govern oil-analysis evidence as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

104 — Recent Oil Service

Lubrication & Separation Fault Chain: govern recent oil service as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

106 — Airend Vibration

Airend & Mechanical Fault Chain: govern airend vibration as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

107 — Bearing Condition

Airend & Mechanical Fault Chain: govern bearing condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

108 — Abnormal Noise

Airend & Mechanical Fault Chain: govern abnormal noise as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

109 — Rotor-Contact Suspicion

Airend & Mechanical Fault Chain: govern rotor-contact suspicion as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

110 — Coupling Condition

Airend & Mechanical Fault Chain: govern coupling condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

111 — Belt Condition

Airend & Mechanical Fault Chain: govern belt condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

112 — Gear Condition

Airend & Mechanical Fault Chain: govern gear condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

113 — Alignment

Airend & Mechanical Fault Chain: govern alignment as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

114 — Soft Foot

Airend & Mechanical Fault Chain: govern soft foot as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

115 — Foundation

Airend & Mechanical Fault Chain: govern foundation as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

116 — Motor Bearing

Airend & Mechanical Fault Chain: govern motor bearing as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

117 — Mechanical Drag

Airend & Mechanical Fault Chain: govern mechanical drag as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

118 — Wear Debris

Airend & Mechanical Fault Chain: govern wear debris as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

119 — Recent Overhaul

Airend & Mechanical Fault Chain: govern recent overhaul as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

121 — Intake Filter

Air Path / Valve / Pressure Fault Chain: govern intake filter as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

122 — Inlet Restriction

Air Path / Valve / Pressure Fault Chain: govern inlet restriction as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

123 — Inlet Valve

Air Path / Valve / Pressure Fault Chain: govern inlet valve as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

124 — Minimum-Pressure Valve

Air Path / Valve / Pressure Fault Chain: govern minimum-pressure valve as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

125 — Blowdown Valve

Air Path / Valve / Pressure Fault Chain: govern blowdown valve as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

126 — Check Valve

Air Path / Valve / Pressure Fault Chain: govern check valve as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

127 — Discharge Valve

Air Path / Valve / Pressure Fault Chain: govern discharge valve as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

128 — Separator Restriction

Air Path / Valve / Pressure Fault Chain: govern separator restriction as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

129 — Aftercooler Restriction

Air Path / Valve / Pressure Fault Chain: govern aftercooler restriction as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

130 — Dryer/Filter Dp

Air Path / Valve / Pressure Fault Chain: govern dryer/filter DP as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

131 — Receiver Pressure

Air Path / Valve / Pressure Fault Chain: govern receiver pressure as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

132 — Distribution Valve

Air Path / Valve / Pressure Fault Chain: govern distribution valve as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

133 — Network Pressure Loss

Air Path / Valve / Pressure Fault Chain: govern network pressure loss as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

134 — Process Demand

Air Path / Valve / Pressure Fault Chain: govern process demand as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

135 — Closed/Incorrect Valve

Air Path / Valve / Pressure Fault Chain: govern closed/incorrect valve as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

136 — Aftercooler

Treatment & Downstream Fault Chain: govern aftercooler as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

137 — Separator/Drain

Treatment & Downstream Fault Chain: govern separator/drain as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

138 — Refrigerated Dryer

Treatment & Downstream Fault Chain: govern refrigerated dryer as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

139 — Adsorption Dryer

Treatment & Downstream Fault Chain: govern adsorption dryer as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

140 — Prefilter

Treatment & Downstream Fault Chain: govern prefilter as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

141 — Afterfilter

Treatment & Downstream Fault Chain: govern afterfilter as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

142 — Condensate Drain

Treatment & Downstream Fault Chain: govern condensate drain as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

143 — Pdp Condition

Treatment & Downstream Fault Chain: govern PDP condition as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

144 — Filter Dp

Treatment & Downstream Fault Chain: govern filter DP as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

145 — Treatment Bypass

Treatment & Downstream Fault Chain: govern treatment bypass as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

146 — Receiver

Treatment & Downstream Fault Chain: govern receiver as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

147 — Distribution Contamination

Treatment & Downstream Fault Chain: govern distribution contamination as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

148 — Point-Of-Use Restriction

Treatment & Downstream Fault Chain: govern point-of-use restriction as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

149 — Critical-User Pressure

Treatment & Downstream Fault Chain: govern critical-user pressure as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

150 — Downstream Process Interaction

Treatment & Downstream Fault Chain: govern downstream process interaction as part of a hypothesis-driven breakdown investigation. Record exact asset and operating state, symptom, alarm/event chronology, measurement or inspection evidence, applicable manufacturer limit or reference, test performed, result, confidence and unresolved uncertainty. Do not clear evidence or replace parts merely because a fault code names a component. Where a test carries electrical, pressure, rotating, thermal or other hazard, use the site's competent-person and isolation controls.

151 — Premium Breakdown Diagnostic Register

152 — Fault Triage Matrix

153 — Fault Code Is a Starting Point, Not Root Cause

A fault code identifies what the controller detected, not necessarily why the condition developed. Preserve context and test the physical/electrical chain before assigning cause.

154 — Repeated Resetting Destroys Diagnostic Value

Repeated resets can overwrite logs, alter operating state, heat/cool components or create secondary damage. Capture evidence first unless immediate safety action requires otherwise.

155 — Parts Swapping Is Not Diagnosis

Replacing a sensor, valve, filter or controller without a tested hypothesis can temporarily change symptoms while the real cause remains.

156 — Recovery vs Permanent Correction

A controlled temporary restoration can be appropriate where risk is understood, but it must be labelled temporary with limitations, monitoring, owner and permanent corrective action.

157 — Verify Under Controlled Load

After repair, confirm relevant protection, pressure, temperature, vibration, controls, treatment and operating behaviour at an agreed representative condition; a machine that merely starts is not fully verified.

158 — Technical / Breakdown Verification Gate

Verify safety, chronology, measurements, hypotheses, tests, repair, as-left behaviour and unresolved uncertainty. No diagnosis-time, response-time or first-time-fix guarantee is invented.

160 — AEO / Engineering FAQ Layer

Answer what to preserve after a compressor trip, why alarms should not be repeatedly reset, how high-temperature/low-pressure/vibration/VSD faults are triaged, and how a repair is verified.