Hamilton Beach Door Switch / Interlock Shorted Closed

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

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.

Possible Causes

Stuck or welded door switch contacts, Miswired door switch assembly, Shorted control relay on control board

Immediate safety warning: Unplug the microwave immediately. A microwave that runs with the door closed and no command can be unsafe.

Do not use the microwave until repaired.

Repair (qualified DIYers/technicians):

Inspect the door switch assembly for a switch that remains closed regardless of door position.
Replace any switch with welded or stuck contacts.
If switches test correctly, the control board relay may be stuck closed and the board should be replaced.

Professional Required 5/5

Door Switch Assembly

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