Café Stuck Vent Fan Relay or Sensor Logic

Over-the-range Café microwave vent fan runs continuously and will not turn off, even when the control shows it as off.

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 circuit, Faulty temperature sensor triggering automatic fan mode

Safety first: Unplug the microwave or switch off the breaker.

Steps to try:

Allow cooling: If the cooktop below was recently used, the automatic fan feature may be running the fan to cool the electronics. Allow 30 minutes and see if it stops.
Power reset: After cooling, restore power. If the fan starts immediately and cannot be turned off via controls, the relay may be stuck.
Service: A technician should test the fan control circuit and replace the main control board if the relay is welded closed.

Hard 4/5

Main Control Board

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