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Onan ยท 23 codes

Cummins Onan Quiet Diesel 5000-12500 generator fault codes

Every fault code, display message, and status light listed in Onan's manuals and support pages for Quiet Diesel 5000 (HDKBA); Quiet Diesel 6000 / 7500 / 8000 (HDKAH, HDKAJ, HDKAK); Quiet Diesel 10000 / 12500 (HDKCA, HDKCB). Select a code for what it means, what you can safely check, and when to call a technician.

Confirm your model

Codes are model-specific. Match the model number on the appliance data label to one of these before using the table:

Quiet Diesel 5000 HDKBA, Quiet Diesel 6000 HDKAH, Quiet Diesel 7500 HDKAJ, Quiet Diesel 8000 HDKAK, Quiet Diesel 10000 HDKCA, Quiet Diesel 12500 HDKCB

Where to look and what to record

  • generator model/spec
  • hour meter
  • fault blink count
  • loads running when the shutdown occurred

Code table

CodeWhat the manufacturer saysListed for
1Engine Over TemperatureAll listed models
2Low Oil PressureAll listed models
3Service CheckAll listed models
4Over CrankAll listed models
12Over VoltageAll listed models
13Under VoltageAll listed models
14Over FrequencyAll listed models
15Under FrequencyAll listed models
19Governor ActuatorAll listed models
22Governor Actuator OverloadAll listed models
24Temperature SenderQuiet Diesel 5000 (HDKBA)
27Voltage SenseAll listed models
29High Battery VoltageAll listed models
32Low Cranking SpeedAll listed models
35Control Card FailureAll listed models
36Engine StoppedAll listed models
38Over Current (Field Overload)All listed models
41Generator RotorAll listed models
42ProcessorAll listed models
43ProcessorAll listed models
45Speed SenseAll listed models
48Generator Field SenseQuiet Diesel 6000 / 7500 / 8000 (HDKAH, HDKAJ, HDKAK); Quiet Diesel 10000 / 12500 (HDKCA, HDKCB)
57Over PrimeAll listed models

Generators can produce carbon monoxide, hot surfaces, fuel hazards, moving-part hazards, and lethal voltage. Shut the generator down and do not open energized compartments unless qualified.

Troubleshooting guides

Official manuals and support pages

OnanCummins Onan RV Generator ManualsOnanCummins Onan Quiet Diesel 10000/12500 HDKCA/HDKCB Operator Manual A043D713OnanCummins Onan Quiet Diesel 5000 HDKBA Operator Manual 0981-0166OnanCummins Onan Quiet Diesel 6000/7500/8000 HDKAH/HDKAJ/HDKAK Operator Manual A046L053