Westinghouse Door Interlock Miswiring / Stuck Relay

Microwave interior light, fan, and turntable run when the door is closed, even without pressing START.

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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

Misaligned or stuck door switches,Shorted relay on control board,Incorrectly installed door switch assembly,Shorted wiring harness at door latch area

How to Fix / Troubleshooting

Danger: This condition can mean the microwave is energizing when it should not. Unplug immediately and do not use until repaired.

Basic checks:

  • 1. Inspect door: Ensure the door closes and opens smoothly and is not warped or damaged.

Advanced steps:

  • 2. Check door switches: With the cover removed, verify that the primary, secondary, and monitor switches operate correctly with the door.
  • 3. Inspect wiring: Look for pinched or shorted wires near the latch.
  • 4. Test control board relays: If switches and wiring are correct, a stuck relay on the control board may be powering components continuously; replace the board if necessary.

Because of the safety implications, this repair is best handled by a professional.

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Repair Difficulty

Professional Required 5/5

Required Part

Door Interlock Switch Assembly
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