Generac
Nuisance retransfer to utility
Generator transfers power but then drops the load back to utility unexpectedly while still running.
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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
Unstable generator voltage or frequency, Loose utility sense wiring, Faulty ATS control board, Incorrect controller settings for retransfer
How to Fix / Troubleshooting
Safety: Use caution when working inside the ATS. De-energize circuits when possible.
- Monitor generator output: Use a meter to log voltage and frequency while under load. Correct any engine or AVR issues causing instability.
- Check utility sense leads: Inspect the wiring from the utility lines to the ATS control board. Tighten loose connections and repair damaged wires.
- Review retransfer settings: On programmable systems, verify the voltage/frequency thresholds and time delays for retransfer are set per Generac recommendations.
- Replace ATS board: If wiring and settings are correct but nuisance retransfer persists, replace the ATS control board.
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Repair Difficulty
Hard
4/5
Required Part
ATS Control Board
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