Toshiba No Start – Door Interlock / Keypad Logic Issue

Microwave display is on but START button does nothing; oven will not run.

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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

Faulty door interlock switch,Door not fully closed or misaligned,Defective START key on keypad,Control PCB input fault

How to Fix / Troubleshooting

Safety first: Unplug the microwave before physical inspection.

Steps to troubleshoot:

  • 1. Check door closure: Ensure the door is fully closed and you hear the usual clicks. Gently press on the door near the latch side and try START again.
  • 2. Test other keys: See if other buttons (e.g., clock, timer, power level) respond. If only START fails, the keypad may be partially defective.
  • 3. Child lock: Verify that the child lock is not enabled (often indicated by a key icon). Follow the user manual to disable it (commonly by holding STOP/CANCEL for several seconds).
  • 4. Power reset: Unplug for 5 minutes, then plug back in and test again.

If still no start: The door interlock switches or keypad/control PCB likely need replacement. These involve safety-critical circuits and should be serviced by a professional.

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Repair Difficulty

Medium 3/5

Required Part

Door Interlock Switch Assembly
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