You might think that your microwave is still on because you can hear it running but what you are hearing.
Exhaust fan on microwave won t shut off.
The exhaust fan will turn on automatically during heavy use of the surface burners on the cook top if the fan thermostat senses too mush heat.
When the microwave gets hot the thermostat closes.
It cannot be turned off manually.
When it cools down enough it will shut off.
The exhaust fan thermostat is usually the failed component.
It will come to help keep the controls cool inside the microwave control panel.
When it senses heat it turns on the exhaust fan.
Thus turning the fan on will keep the electronic control board from getting too hot.
Microwave has automatic fan ignition setting pre programmed to keep the unit components from over heating.
If pushing the stop button does not turn off your microwave try opening the door while it is still.
Fridgidaire microwave will not turn off check the fan.