Onan ยท 14 codes
Cummins Onan Quiet Diesel 3200 generator fault codes
Every fault code, display message, and status light listed in Onan's manuals and support pages for Quiet Diesel 3200 (HDZAA Spec A-F). 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 3200 HDZAA Spec A-E, Quiet Diesel 3200 HDZAA Spec F
Where to look and what to record
- generator model/spec
- operator panel message
- hour meter
- loads running when the message appeared
Code table
| Code | What the manufacturer says |
|---|---|
| GEN CAL | The generator is in calibration mode during startup and is not yet ready to produce AC output voltage |
| GEN OFF | The generator set is off but ready to start |
| GEN ON | The generator set is running |
| GEN START | The start button was pressed but the engine may not be cranking |
| GEN WAIT | The generator is delaying the next start attempt for starter cooling or cold-weather preheat |
| GENERATOR ALERT | Operator-panel communication, PMA auxiliary power, engine speed, or inverter faults may have occurred |
| LOW BATTERY | Battery voltage is below the minimum value needed to start the generator |
| LOW ENGINE POWER | Engine speed is below the specified threshold |
| OIL CHANGE/CHECK OIL LEVEL | The hour counter reached the oil check or oil change maintenance interval |
| OIL TEMP-PRESS | Engine lubricating oil temperature is too high or oil pressure is too low |
| OVER TEMPERATURE (INVERTER) | The inverter temperature exceeded its limit |
| OVERLOAD | Too many loads are connected or the inverter is defective |
| RESTART GEN? | The generator set stopped and the operator panel is prompting for a restart decision |
| SHORT CIRCUIT | A connected appliance probably has a short circuit and AC output was turned off while the engine cools the generator set |
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
- Onan generator stopped and shows a fault code
- Onan EC-AGS+ generator does not run A/C
- Onan generator exhaust smell, CO detector, or ventilation shutdown
- Onan generator fuel, oil, and maintenance checks before starting
- Onan generator high-altitude derating and fewer appliances
- Onan generator low battery or slow cranking
- Onan generator no-start cranking delay or overcrank
- Onan generator running but no output or breaker/load problem
- RV appliance low-voltage warning