DuroMax
Automatic Start Failure (ATS Control Issue)
Generator will not start automatically during a utility 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
ATS not sensing utility loss, Open start signal wire, Misconfigured exercise/auto mode, Failed ATS control relay
How to Fix / Troubleshooting
Safety first: Turn OFF utility power at the main breaker and place the ATS in OFF or MANUAL. Turn OFF the generator and disconnect battery negative before opening panels.
- Verify AUTO mode: Ensure the generator controller is set to AUTO and not MANUAL or OFF.
- Simulate outage: With caution, open the utility main breaker and observe whether the ATS sends a start signal. If not, suspect ATS control issues.
- Check control wiring: Inspect the low‑voltage control wires between ATS and generator for continuity and correct terminal connections.
- ATS relay: If wiring is intact, the ATS start relay may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
ATS Start Relay
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