Cummins
Auto-Exercise / Auto-Start Scheduling Failure
Generator fails to exercise automatically on schedule
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Possible Causes
Incorrect date/time or schedule settings in controller, Controller in OFF or MANUAL mode instead of AUTO, Fault in remote start wiring from ATS, Disabled exercise function
How to Fix / Troubleshooting
Safety first: Be aware the generator may start unexpectedly when auto mode is restored. Keep clear of moving parts.
- Controller mode: Ensure the Cummins controller is set to AUTO, not OFF or MANUAL.
- Check schedule: Enter the controller menu and verify the exercise schedule, date, and time are set correctly.
- Remote start circuit: Inspect wiring between the ATS and generator start terminals. Repair any open circuits.
- Test auto-start: Simulate a utility power loss (if safe and per procedure) or use the controller’s test function to verify automatic start.
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Repair Difficulty
Easy
2/5
Required Part
Generator Controller Module
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