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Question is it normal for the exhaust fan to turn on automatically whena certain temp is reached even if is the concentional onajdeliplu

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It is most likely the fan is coming on to cool the inside circuitry of the oven, not the exhaust fan

Posted on Mar 16, 2011

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1 Answer

Vent fan wont turn off


Steve,

The vent fan is thermostat controlled to protect the control panel. Once the panel temp drops, this will turn off by itself. This is normal for this to occur when your steaming and cooking for a long time. Good Luck

Apr 22, 2014 | Maytag Over-the-Range Microwave

1 Answer

The fans on this microwave will automatically turn on when I have more than one burner on the gas range going. The fan is horrendously loud and will not allow me to shut off for 2-3 minutes regardless if I...


That's typically normal operation. The microwave has a thermostat which turns on the hood vent exhaust fan at a certain temperature to protect the controller.

Your owner's manual will cover vent fan operation.

If for some reason you don't have yours, you can download Whirlpool owner's manuals and installation instructions here.

I always recommend that you use the vent fan whenever you're cooking on the stove top to keep heat, steam, and grease out of the controls and door panels.

If - above and beyond this - the fan has a problem, that could make it excessively loud. Some are just loud though, it's hard to judge without actually hearing it.

You can contact Whirlpool customer service with your model number via that link above and ask them about the loudness. They may be able to tell by listening over the phone if it's abnormally loud.

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

Apr 28, 2011 | Whirlpool MH7130XE Microwave Oven

1 Answer

Microwave vent turned on by itself and won't turn off


The HMV9305 has an automatic vent turn-on feature. It senses heat, possibly from the oven or range beneath, and turns on the exhaust fan until temps return to normal. Sometimes this may take 4-5 minutes, which can seem like an eternity of listening to the blower run, but it is a safety feature designed to prevent damage to the microwave from excessive heat generated by the cooktop or oven beneath it.

Jan 24, 2010 | Bosch HMV9305 Microwave Oven

1 Answer

Ge jvm1540dm2ww over the range unit: have a gas range and the fan on the above mounted microwave once in awhile turns on automatically while something is cooking on the range below it....


The heat sensor in the electronics panel senses the rise in heat from the stove below. Once the amount of heat reaches a certain level, the cooling fan turns on to keep the electronics inside the microwave cooled.

I wouldn't worry about it. mine does the same thing.

Jun 19, 2009 | Microwave Ovens

1 Answer

Cooling fan hums and turns slow.


You will need to replace the cooling fan motor. Remove it and check the numbers on the fan and then do an online search for the motor. you can also contact a website called the repairclinic.

Oct 20, 2017 | Whirlpool MH1170XS Microwave Oven

1 Answer

Exhaust fan turns on unwanted.


That is normal with all microwave ovens with built in exhaust fans.

Apr 05, 2009 | Microwave Ovens

1 Answer

I have an over the stove kitchenaid microwave w exhaust hood. About 1/2 hour after boiling water on my stove, my microwave comes on. I have unplugged the microwave-----any ideas?


The issue is probably your exhaust fan on your microwave comes on automatically when it detects a certain temperature. Mine does this as well but will turn off automatically after temperature goes down.

Feb 25, 2009 | KitchenAid KHMS155LSS 1000 Watts Microwave...

1 Answer

Vent fan high comes on automatically with cooking


Right, that would be MCO10UW and the owner's manual is here.

The owner's manual does say this, of course,

"To prevent overheating from taking place, the exhaust
fan is designed to automatically turn on at a low speed if
excessive temperatures occur. Should this happen, the
fan cannot be manually turned off, but it will
automatically turn off when the internal parts have
cooled. The fan may stay on for up to an hour after the
range and microwave oven controls have been turned
off."

That;'s standard on microwaves.

But these models do have a separate internal cooling fan (which should run any time you microwave) plus the hood vent exhaust fan, which should only run when you select it, or if there is an excessive stovetop or under-hood temperature.

So if it comes on whenever you microwave, that is incorrect.

When that happens, it's usually a defective vent thermal switch (a.k.a. hood TCO).

But since it's brand new, I would certainly contact Magic Chef about this. If it's in need of repair, they will fix it free, assuming the oven wasn't physically damaged.

For more help from Magic Chef / Ewave see here or their contact page.

For Magic Chef in Canada call 866.587.2002

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

Jan 08, 2009 | Magic Chef CMV1000B Microwave Oven

1 Answer

FAN!!!


Oh, it turns out the the microwave was over heated and the fan was cooling it. The fan will automatically turn on and stay on until your microwave reaches normal temp. just unplug your microwave and let it cool off. then plug it in and everything should be just fine.

May 25, 2008 | Frigidaire GLMB209D Microwave Oven

1 Answer

Mircowave works, exhaust door opens, fan stop working


From looking at the owner's manual, it looks like the vent fan is only supposed to come on when the internal temperature of the microwave gets too high OR when you press the VENT FAN pad. Here are a couple of fan-related excerpts from the owner's manual, which can be found here: http://products.geappliances.com/ProdContent/Dispatcher?REQUEST=SKUOBJECTS&DOCUMENT=Use%20and%20Care%20Manual&SKU=JVM1840BD (or the better URL here: http://tinyurl.com/yn7r6g) Automatic Fan An automatic fan feature protects the microwave from too much heat rising from the cooktop below it. It automatically turns on if it senses too much heat. If you have turned the fan on, you may find that you cannot turn it off. The fan will automatically turn off when the internal parts are cool. It may stay on for 30 minutes or more after the cooktop and microwave controls are turned off. - Vent Fan The vent fan removes steam and other vapors from surface cooking. Press VENT FAN once for high fan speed, twice for medium fan speed, a third time for low faw speed, or a fourth time to turn the fan off. Press the VENT FAN BOOST pad for extra fan speed. - Hope this helps.

Oct 31, 2006 | GE JVM1840 Microwave Oven

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