Commercial Chef Door Switch Logic Fault – Light Circuit Stuck

Microwave interior light stays on when the door is closed and not running.

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

Failed door switch stuck in door-open position, misaligned door latch, shorted light control relay on control board

Safety: Unplug the microwave before inspection.

Door and switch checks:

Open and close the door several times to see if the light ever turns off.
Remove the cabinet and locate the door switches. Test each with a multimeter to verify that the light-control switch changes state when the door moves.
Replace any switch that does not change state reliably.

If switches are good: The control board's light relay may be stuck closed. Replacing the main control board is typically required.

Medium 3/5

Door Switch Assembly

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