Kohler-SDMO Automatic Transfer Switch Control Fault

Generator will not transfer load automatically when mains fails, but can be loaded 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 ATS control coil, Miswired ATS control circuit, Failed ATS controller, Incorrect interlock wiring between APM and ATS

How to Fix / Troubleshooting

Safety first: Isolate mains and generator sources before opening the ATS. Only qualified electricians should work on transfer switches.

  • Manual operation: Verify that the ATS can be operated manually between mains and generator positions.
  • Control voltage: Check that the ATS coil receives the correct control voltage from the APM controller during a simulated mains failure.
  • Auxiliary contacts: Inspect and test ATS auxiliary contacts that signal position to the generator controller.
  • Controller settings: Verify APM controller is configured for the correct ATS type and control logic.

Complex ATS issues often require the original installer or a Kohler-SDMO technician to diagnose and correct.

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Repair Difficulty

Professional Required 5/5

Required Part

Automatic Transfer Switch (ATS) Coil
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