Proline Door Switch or Control Logic Fault

Microwave light stays on and fan may run whenever the door is open; may be accompanied by a humming sound.

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

Stuck door switch, Misaligned door latch, Shorted control relay, Incorrect wiring after previous repair

Safety first: If you suspect the magnetron may be running with the door open (unusual humming), unplug the microwave immediately.

User-level checks:

Open and close the door several times to see if the light and fan behavior changes.
If the fan runs loudly or inconsistently with door position, do not use the microwave.

Next steps:

A technician must inspect and test the door switches and control board relays to correct the fault.

Hard 4/5

Door Interlock Switch Assembly

Check Price on Amazon

We may earn a commission from links on this page.