The exhaust fan thermostat is usually the failed component. When it senses heat it turns on the exhaust fan. If you are cooking on the cooktop, it can sense the heat and the fan won't turn off until the thermostat cools.
On several models of microwaves the thermostat is super sensitive, causing the exhaust to run longer than needed. Replacing the thermostat didn't help much. Adding a washer under the thermostat allowed air to move around it, keeping it cooler, thus, the fan didn't run as long.
It is also common for this thermostat to fail causing the fan to constantly run.
The thermostat is a round disk with 2 terminals. It is a simple bimetal that warps to make or break contact. It is an inexpensive part $20-$50.
It is NOT an easy part to get to. The microwave has to be completely uninstalled and placed on a sturdy table. The cabinet needs to be removed. Then discharge the capacitor. If you don't know how to properly discharge a capacitor, I would suggest having it repaired by a certified/qualified technician.
==UNPLUGGED == A CAPACITOR CAN HOLD UP TO 4,000 VOLTS.
THAT CAN AND WILL KILL YOU...DEAD
댓글 4개
It is Aug 2019 and this answer helped me. Answers are timeless. Keep on answering. It might be too late for the first person who asked but for the rest of us - golden.
Jill Steiner 의
Jill, thank you. I appreciate your comment.
LadyTech 의
Had the same problem with my new free standing Samsung. Tried everything to switch off the fan, which was preventing me from using the microwave. Tried hitting hit under the control panel- nothing, then tried hitting on the top of the microwave . Bingo! Fan stopped and microwave now works again! Thank you for the tip!
Jules Good 의
My vent fan has always come on during exceptional cooking times but now it is coming on even when I just boil water,
Kathy Maciejewski 의