Honeywell
Auto-start control circuit failure.
Generator will not start in AUTO mode 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
Faulty exercise timer or controller logic, open start signal wire from ATS, misconfigured controller mode, defective remote start input.
How to Fix / Troubleshooting
Safety first: Ensure the generator is in OFF before working on control wiring. Disconnect the battery negative terminal when accessing the controller terminals.
Steps:
- Confirm mode: Verify the Honeywell controller is set to AUTO, not OFF or MANUAL ONLY.
- Exercise timer: Check the programmed exercise time and day. Reprogram if incorrect.
- ATS start signal: At the controller terminal strip, verify that the start signal from the ATS closes when utility power is lost (simulate a power outage with proper safety procedures).
- Wiring continuity: Test the continuity of the remote start wires between the ATS and generator. Repair any breaks.
- Controller replacement: If wiring and ATS operation are correct but AUTO start still fails, the controller may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Generator Controller.
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