Onan
Auto-Start / Remote Start Failure
Generator does not start automatically during a utility power outage, but starts manually
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect auto mode setting on controller, Faulty start signal from transfer switch, Broken remote start wiring, Misconfigured controller parameters
How to Fix / Troubleshooting
Safety first: Be aware that restoring auto-start can cause the generator to start unexpectedly. Keep clear of moving parts.
- Check controller mode: Ensure the Onan controller is set to AUTO or REMOTE mode, not OFF or MANUAL only.
- Simulate power loss: With proper safety procedures, simulate a utility outage and monitor whether the ATS sends a start signal to the generator.
- Inspect remote wiring: Trace the start/stop wires from the ATS to the generator. Repair any breaks or loose connections.
- Controller configuration: Verify start/stop logic and delays in the controller menu per Onan documentation. Correct any misconfigurations.
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Repair Difficulty
Medium
3/5
Required Part
Remote Start Wiring Harness
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