Microwave displays E9 and will not run; interior light and fan may still operate when door is opened.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Unplug the microwave. Door interlock circuits are a critical safety system.
Door function check:
- Open and close the door while listening for distinct clicks from the switches. If you do not hear multiple clicks, a switch may not be actuating.
- Check that the door closes flush and the latch hooks are not broken or worn.
Switch testing:
- Remove the outer cabinet and access the door interlock assembly.
- Label and disconnect wires from the monitor switch.
- Using a multimeter, verify that the monitor switch changes state correctly (usually closed when door is open, open when door is closed). Replace if it does not operate as specified.
- Inspect wiring for pinched or burned insulation and repair as needed.
Reassemble and test: After replacing any faulty switch or latch parts, reassemble and test for normal operation without the E9 code.
Repair Difficulty
Required Part
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