LG Stuck Relay or Door Switch Miswiring

Microwave light, fan, or turntable runs when the door is closed but no cook cycle is set, or continues running after cycle ends.

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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

Welded relay on main PCB, Misadjusted door switch bracket, Shorted control board output transistor, Liquid damage on control PCB

How to Fix / Troubleshooting

Critical safety: Unplug the microwave immediately. A stuck relay or miswired switch can cause unsafe operation.

User actions:

  • Do not use: Do not attempt to run the microwave until it has been inspected.
  • Document behavior: Note which components (light, fan, turntable) run unexpectedly to help the technician diagnose the issue.

Repair requires testing relays and door switch circuits on the main PCB and interlock assembly. This must be done by a qualified technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Main PCB (Relay Section)
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