DuroMax Failure to Transfer Load

Generator starts automatically during outages but does not transfer load

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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

Stuck ATS contactor, ATS control board fault, Incorrect interlock wiring, Mechanical obstruction in transfer mechanism

How to Fix / Troubleshooting

Safety first: Isolate both utility and generator sources by opening their main breakers. Only qualified persons should service the ATS.

  • Observe ATS operation: During a test, watch the ATS contactor. If it hums but does not move, the mechanism may be jammed.
  • Manual operation: If the ATS allows manual transfer, attempt to move it. Binding or stiffness indicates mechanical issues.
  • Inspect interlocks: Ensure no foreign objects or misaligned covers are blocking the contactor movement.
  • Replace contactor or board: A failed contactor coil or control board will need replacement with DuroMax‑approved parts.
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Repair Difficulty

Professional Required 5/5

Required Part

Automatic Transfer Switch Contactor
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