Question about Magic Chef CMV1100 Microwave Oven

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My fan kicked on by itself and won't shut off

It won't shut off just wondering if it is supposed to do that if it gets too hot from me cooking.

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Hi,

The over the range microwave hood has a heat sensor in it. If it senses hot temperatures from cooking below it will turn the fan on. The fan will turn off once it cools down, this is to protect the microwave controls from damage.

Posted on May 08, 2010

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Posted on Jan 02, 2017

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Why does microwave turn itself off occasionally after a minute or two


There is a fan inside that blows air across the electromagnet that cooks your food. It gets hot! The fan is most likely broken or spinning to slow to keep the electromagnet cool enough. There is a thermal sensor on the electromagnet to shut off the oven if it gets to hot to prevent it from catching on fire or melting everything inside the oven control area.

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My microwave shuts off, black no power when ever I cook tv dinners, potatoes etc. after 2.5 or 3 minutes. After 10 minutes or so, power comes back on and it displays PF. lots of steam inside after.


Hi Kerry,
"PF" is power falure if you didn't aready know this. It sounds to me like the coolig fan might be running slow or there is blocked or restricted air flow through the unit. This cooling fan is only for the HV transformer and magnetron. Sometimes you may get air flow around the door but this is incidental. The PF tells me that the power is being interrupted either at the power source (wall outlet or circuit breaker) or the magnetron TCO is cutting out. It also could be a bad magnetron running too hot. As far as the steam goes, I usually just leave the door open on my microwave for 10 or 15 minutes to let the condensation evaporate.

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Actually, that's a feature! If you cook much on the range (stove) beneath the microwave, the heat will cause the microwave bottom to heat up quite a bit (just touch it!), and the microwave will turn on it's exhaust fan in an attempt to save itself from burning up. It will shut off in about 15 minutes after you turn off the source of heat.
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I have a Kenmore microwave. The vent will just start on its own and can't shut off


Actually, that's a feature! If you cook much on the range (stove) beneath the microwave, the heat will cause the microwave bottom to heat up quite a bit (just touch it!), and the microwave will turn on it's exhaust fan in an attempt to save itself from burning up. It will shut off in about 15 minutes after you turn off the source of heat.
But if the fan comes on by itself even when the microwave is cool (or at least not hot), then you probably have a defective fan thermostat. This thermostat is located behind the control console on the inside bottom of the microwave.

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Hello Derrick Baker - Typically no fan should come on without starting the microwave. There is one exception! For an example, if the microwave becomes too hot from something that is cooking on the stove below the microwave, the fan will come on and will cycle off once the bottom of the microwaves cools back down. If the fan is turning on when the door is closed, more than likely, a door switch as failed. At this point, I recommend connecting with a certified technician to move forward accurately to assist with the repairs.

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I have a MV1604ST over the range microwave oven. After I made my daughter's breakfast this morning, the fan kicked on and will not shut off. It has been running for hours. The microwave still works and...


There si a sensor on the bottom of those Micros that is supposed to turn the fan on when it closes, meaning it is hot, then opening when it cools back down. I expect you have a bad thermal sensor. I have very seldom found these to go bad. Another thing that can cause it is a bad door switch back feeding voltage where it is not supposed to. It will make the fan that cools the magnetron run until the bad switch is replaced.

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Neither the owner's manual nor the quick start guide for this model addresses that specifically, but most commercial microwaves do work this way to ensure proper cooling.

The manual does state that when you open the door then close it, the light and fan will stay on for an unspecified period of time.

If the word "HOT" appears in the display, the magnetron is overheated and the fan will run until the temperature is brought down.

If the fan fan NEVER shuts off, then there may be a stuck relay or defective sensor.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Fan turned on after cooking because a thermostat got to hot and tripped turning on the fan to try to cool the unit.  The unit went completely dead when thermal fuse tripped which is located above the cavity on the left side.

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