Morphy Richards
Door Switch / Monitor Switch Miswiring
Microwave light and fan come on as soon as 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 primary door switch, Misadjusted door switch bracket, Incorrectly wired monitor switch, Shorted control relay contacts
How to Fix / Troubleshooting
Safety: Unplug the microwave immediately. Operating in this condition is unsafe.
Steps (for trained persons):
- 1. Inspect door switches: Remove the cabinet and locate the door switch cluster. Check that each switch actuator moves freely and is not jammed.
- 2. Verify wiring: Compare the wiring of the primary, secondary, and monitor switches to the service diagram. Correct any miswired connections.
- 3. Test switches: Use a multimeter to confirm each switch changes state correctly when the door is opened/closed.
- 4. Check control relay: If switches are correct, the main power relay on the control PCB may be welded closed and require PCB replacement.
Because this fault affects safety interlocks, repairs should be done by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Door Interlock Switch Kit
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