Toshiba Door Switch Contact Welded / Miswired

Microwave interior light, fan, and turntable come on 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

Welded relay on control PCB,Shorted primary door switch,Incorrect door switch alignment,Control board logic fault

How to Fix / Troubleshooting

Danger warning: If the microwave appears to run with the door closed but without pressing START, there is a serious safety fault. Do not use the microwave.

Immediate actions:

  • 1. Unplug the unit immediately: Do not attempt to run it again until repaired.
  • 2. Do not open the cabinet: The issue involves safety interlocks and high-voltage control.

Service requirement: A qualified technician must inspect the door switch assembly and control PCB, replace any welded switches or relays, and verify that the magnetron does not energize with the door open.

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Repair Difficulty

Professional Required 5/5

Required Part

Door Interlock Switch Assembly
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