Frigidaire Stuck Fan Relay or Control Board Fault

Microwave fan runs whenever the unit is plugged in, even when not cooking.

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 relay on main control board, Shorted control transistor, Miswired fan circuit, Control board firmware issue

Safety First: Unplug the microwave before inspection.

Steps:

Verify settings: Ensure the vent fan is not set to an automatic or always-on mode (check user manual).
Power reset: Unplug for 10 minutes and reconnect. If the fan starts immediately without any command, the control board relay is likely stuck.
Replace board: A technician should replace the Frigidaire main control board to correct the stuck relay.

Hard 4/5

Main Control Board

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