GE Stuck Vent Fan Relay or Sensor

Over-the-range microwave vent fan runs continuously and will not turn off, even when controls are off and cooktop is cool.

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 fan relay on main control board, Shorted fan control switch, Faulty cooktop temperature sensor (if equipped)

Safety: Unplug the microwave before inspection.

Allow cooling: Ensure the cooktop below is cool; some GE models run the fan automatically when high heat is detected.
Control reset: Unplug for 5–10 minutes to reset the control board. If the fan runs immediately upon power-up, the relay may be stuck.
Service control board: A technician will typically replace the main control board if the fan relay is welded closed.

Hard 4/5

Main Control Board

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