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Control Logic or Relay Failure
Microwave interior light and fan turn on, but unit will not start cooking when START is pressed
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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 control board relay, Door switches not signaling closed, Defective start button circuit, Internal control board fault
How to Fix / Troubleshooting
Safety: Unplug the microwave before internal inspection.
User-level checks:
- Open and firmly close the door, then try again.
- Check if any error icons or lock indicators are lit on the display.
- Attempt a control reset by unplugging for 5 minutes.
Technical checks:
- Test the door switches for proper operation.
- Inspect the control board for burned or stuck relays.
- Verify the START button signal reaches the control board (via keypad ribbon).
Replace the main control board if relays or logic circuits are defective.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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