RV Atlas

Onan ยท 29 codes

Cummins Onan QG 2800i / 2500i LP inverter generator fault codes

Every fault code, display message, and status light listed in Onan's manuals and support pages for QG 2800i / 2500i LP (HGLAA Spec A-B). 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:

QG 2800i/2500i LP HGLAA Spec A, QG 2800i/2500i LP HGLAA Spec B

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 says
1High Engine Temperature
4Over Crank
6Low Oil Level
12Output Over Voltage
13Output Under Voltage
14Output Over Frequency
15Output Under Frequency
19Actuator Circuit Fault
25Alternator Over Voltage
26Alternator Under Voltage
27PMA Sense Lost
29Battery Over Voltage
31Engine Over Speed
32Crank Under Speed
34High Inverter Temperature
35EE Checksum Fault
36Mechanical Fault
38Output Over Load
43RAM Fault
45Crank Position Sense Lost
49Actuator Over Load
52Injector/Lift Pump Circuit Fault
53Oil Temperature Sensor Circuit Fault
54MAT Sensor Circuit Fault
56MAP Sensor Circuit Fault
67IGBT Over Current Fault
74Unprogrammed Board
81Alternator Stator Circuit Fault
82Vent Pressure Sensor Circuit Fault

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 QG 2800i/2500i LP HGLAA Spec A Operator Manual A062Y985OnanCummins Onan QG 2800i/2500i LP HGLAA Spec B Operator Manual A075S349