Kohler
Intermittent Transfer / Nuisance Drop-Out
Generator starts and transfers, then drops out and utility power returns repeatedly
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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 sensing connections in ATS, Controller sensing thresholds set too tight, Marginal fuel supply causing engine surging
How to Fix / Troubleshooting
Safety first: Use caution around live panels. If unsure, contact a professional.
- Monitor generator: With a meter, monitor voltage and frequency at the generator during load. Large swings indicate engine or AVR issues that must be corrected.
- Inspect ATS sensing: Tighten all small-gauge sensing wires in the ATS and at the generator controller.
- Fuel and air: Ensure gas pressure is stable and air filter is clean to prevent engine surging.
- Controller settings: Have a technician review transfer and retransfer voltage/frequency thresholds in the Kohler controller and ATS to ensure they match specifications.
Repeated transfers can stress connected equipment; resolve the root cause before further operation.
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Repair Difficulty
Hard
4/5
Required Part
Automatic Transfer Switch Control Board
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