Microwave interior light, fan, and turntable run when the door is closed, but it stops when you open the door (appears to run with door open/closed incorrectly).
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
Critical safety: A microwave that appears to run with the door open is dangerous. Unplug it immediately and do not use until repaired.
Checks (qualified):
- Remove the cabinet and inspect the door switch assembly.
- Verify each switch is wired to the correct terminals (COM, NO, NC) according to the Neff wiring diagram.
- Test each switch with a multimeter to ensure it changes state correctly when the door is opened/closed.
- If wiring is correct and switches are good, inspect the control board for a stuck relay and replace the board if necessary.
Because of the risk of microwave leakage, this fault should be corrected by a professional technician.
Repair Difficulty
Required Part
We may earn a commission from links on this page.