Cummins/Onan DGFS troubleshooting: 9 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan DGFS — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Symptom | Cause | Remedy |
|---|---|---|
| Generator does not start | Check the fault codes and refer to the troubleshooting table for specific issues. Ensure that all connections are secure, and the control panel is powered on. | |
| Generator produces low voltage output | Refer to the fault codes and troubleshooting table for possible causes such as a faulty alternator or incorrect settings. Check the generator's load and ensure it is within the rated capacity. | |
| Generator produces high voltage output | Refer to the fault codes and troubleshooting table for possible causes such as a faulty alternator or incorrect settings. Check the generator's load and ensure it is within the rated capacity. | |
| Generator produces inconsistent voltage output | Refer to the fault codes and troubleshooting table for possible causes such as a faulty alternator or incorrect settings. Check the generator's load and ensure it is within the rated capacity. | |
| Generator produces inconsistent frequency output | Refer to the fault codes and troubleshooting table for possible causes such as a faulty alternator or incorrect settings. Check the generator's load and ensure it is within the rated capacity. | |
| Generator produces noise during operation | Refer to the fault codes and troubleshooting table for possible causes such as a faulty alternator or incorrect settings. Check the generator's load and ensure it is within the rated capacity. | |
| Generator produces excessive heat | Refer to the fault codes and troubleshooting table for possible causes such as a faulty alternator or incorrect settings. Check the generator's load and ensure it is within the rated capacity. | |
| Generator produces smoke | Refer to the fault codes and troubleshooting table for possible causes such as a faulty alternator or incorrect settings. Check the generator's load and ensure it is within the rated capacity. | |
| The engine does not start | The starter will disengage after a specified period of time and the control will indicate an overcrank shutdown. | Place the O/Manual/Auto switch in the O position and press the Fault Acknowledge/Reset button. Before attempting to restart, wait two minutes for the starter motor to cool and then repeat the starting procedure. If the engine does not run after a second attempt, refer to the Troubleshooting section. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: The starter will disengage after a specified period of time and the control will indicate an overcrank shutdown.. See the table for the matching fixes.