Kohler Automatic Transfer Switch (ATS) Fails to Transfer Load

Generator runs but does not transfer power to the house

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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 control wiring fault between generator and switch, Stuck or failed transfer switch contactor, Incorrect ATS configuration, Utility sense fuses blown in ATS

How to Fix / Troubleshooting

Safety first: This involves live electrical equipment. Turn generator OFF, lock out the ATS, and verify absence of voltage before opening covers. If you are not a qualified electrician, do not attempt internal ATS repairs.

  • Check generator output: With the main breaker open, start the generator and verify correct voltage at the generator output lugs. If no voltage, troubleshoot generator side first.
  • ATS status: Observe the ATS position indicator (UTILITY/GEN). If it remains on UTILITY during an outage, the ATS is not receiving or acting on the start/transfer signal.
  • Control wiring: Inspect the low-voltage control cable between the Kohler controller and the ATS for damage or loose terminals.
  • Sense fuses: Many ATS units have small fuses for utility and generator sensing. With power off, remove and test these fuses; replace if blown.

Mechanical or coil failure of the ATS contactor requires replacement of ATS components by a licensed electrician or Kohler dealer.

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Repair Difficulty

Professional Required 5/5

Required Part

Automatic Transfer Switch Contactor
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