Bertazzoni
Door Switch / Interlock Misalignment
Microwave interior light, fan, and turntable run 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
Stuck or welded door switch contacts, Misaligned door latch, Shorted control relay, Damaged latch bracket
How to Fix / Troubleshooting
Safety first: Unplug the microwave immediately; this is a safety-critical fault.
- Step 1 – Do not use the unit: Operating with faulty door interlocks can be hazardous.
- Step 2 – Inspect door and latch: Check for visible damage to the door hooks or frame. Ensure the door closes squarely and fully.
- Step 3 – Switch replacement (advanced): With power disconnected and cover removed, test each door switch with a multimeter. Replace any switch that shows continuity when it should be open.
- Step 4 – Check control relay: If switches are good, the main relay on the control board may be stuck closed and the board will need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Door Interlock Switch Kit
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