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Fan keeps going after Microwave stops

How can i stop my built-in microwave fan, when i close the door, its ok heating up items

I don't know the model no. as it came with the Ikea Kitchen

Thanks for your help, as i'm glad i found your site!

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As i found the manual for it: it's a

BUILT-IN Microwave Oven MUMW23SS With Building In Trim TUK23SS, if that helps.


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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.



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Hi @LadyTech,

Your answers are good but can I suggest that you check the posted date of the question before you answer a question. It might save you some time that you can better use on a more 'recently asked' question.


I hadn't paid much attention to the dates.

I thought I'd help out on the unanswered questions .

LoL I'll pay attention the dates from now on. Thanks


Why would you tell someone not to answer a question just because it wasn't asked recently? This is the only answer and is on the first page of Google results. The bane of my life is finding relevant questions online with no answers.


Bobby, thank you for helping me out! I feel the same as you do. I’ll continue answering questions no matter how old they are. I like to compare all answers when I’m searching for help. Dates don’t matter.


Thank you for answering this expired question. I am looking for an answer to this question now. June, 2018. It was a helpful answer. Thank you.


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