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Vent fan won't turn off

The fan came on while cooking and won't go off even when we push the button to turn it off and even after unplugging for 5 minutes. i have even flipped the breaker and it still won't turn off.

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  • Microwave Ovens Master
  • 8,820 Answers

This may be a shorted hood fan TCO (thermal cutout or thermostat) or a problem on the control board.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

Atour Web site, we have a videoavailable showing how to remove a typicalover the range control panel assembly in under 5 minutes.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases in about a week or so.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Posted on Dec 21, 2008

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Cannot unlock the display panel


Elise,

So I'm understanding that the lock icon stays on no matter what you have tried. I would try pressing and holding the START/STOP button for 5-10 seconds to see if it changes. I don't know how long you've been leaving it unplugged for when you do unplug it, but i would suggest at least 3-5 minutes. If these don't work what I would do is either contact the manufacturer or maybe even a local authorized technician. This way they would be able to assist and possibly have some more suggestions or be able to find and solve the issue for you.

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I had the same problem with the fan not wanting to shut off after the repair. Once I set the clock though I was able to push the button to shut the fan off. So try setting your clock first and see if that helps.

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JennAir Microwave works perfectly but won't quit running.


One or two of the micro switches have failed, you will need a professional to remedy the situation.

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Microwave won't work, I was cooking on the stove and the fan came on and then everything went out on the microwave suddenly


There is a thermostat which detects when the temperature from the cooktop is too high, and it makes the hood vent exhaust fan come on to cool it to protect the controller.

That's 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.

Assuming the wall outlet is good, the first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes.

If it's still dead, another thermostat may be blown,or the fuse.

You can find links to helpful exploded view diagrams and order parts here.

I'd recommend that your bookmark this link to your favorites.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Usually the fuse and magnetron thermostat will be accessible for testing behind the controller.

If those are good, then it may be a bad oven cavity thermostat, and checking that will require you to remove the oven from the wall and take off the outer cover.

Behind the controls in many microwaves is a technical sheet, which helps in locating and testing components.

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

Nov 02, 2011 | Magic Chef MCO160UQ Microwave Oven

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Does the exhaunst fan turn on automatically when we cook or warm food items in our Samsung Microwave -- SMH 9187W?


Some interesting reading on page 8 of the owner's manual:

"Boilovers cause smoking and greasy spillovers that may ignite and spread if the vent fan is operating.To minimize automatic fan operation, use adequate sized cookware and use high heat on surface units only when necessary."

And on page 20:

"If the temperature becomes too hot around the microwave oven, the fan in the vent hood will automatically turn on at the LEVEL 2 setting to cool the oven. The fan will automatically turn off when the oven has cooled down sufficiently. This is an automated process and cannot be turned off. The fan may stay on for 30 minutes or more after the cooktop and microwave controls are turned off. The Vent Fan will only operate in 1~4 levels modes while the microwave is working."

"Using the Vent delay off button
1. Press the Delay Off button once to turn the fan off after 1 minute.
2. Press the Delay Off button twice to turn the fan off after 3 minutes.
3. Press the Delay Off button three times to turn the fan off after 5 minutes.
4. Press the Delay Off button fiour times to turn the fan off after 10 minutes.
5. Press the Delay Off button five times to turn the fan off after 30 minutes."

If for some reason you don't have your owner's manual, you can still download it free here.

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

Jan 01, 2011 | Samsung Microwave Ovens

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.

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I have an LG LMVH1750ST microwave convection oven. When I activate the fan for cooking purposes and then try to turn off, it does not respond. I have to pull electrical plug and reprogram for one minute....


From the owner's manual under OPERATION "VENT FAN":

"If the temperature from the range or cooktop below the oven gets too hot, the vent fan in the vent hood will automatically turn on at the 4-Speed setting to protect the oven. When this occurs, the VENT ON/OFF pad will not turn the fan off."

You should check your "vent fan auto time set" setting.

Here's one thing to try to set it to turn off after 10 minutes:

Touch the Vent ON/OFF pad, then touch the "5-SPEED VENT" pad until "level 4" appears in the display, then touch "AUTO TIME SET" the desired number of times.

We're happy to help and we appreciate your thoughtful rating of our answer.

Jun 19, 2008 | LG Microwave Ovens

1 Answer

Kenmore 665 68610891- built-in 1998 model


Fan relay on circuit board stuck. Give it a tap (the relay), to free it up. Otherwise get the relay or driver transistor replaced. Easy fix. Take it to an electronic repair place, not the brand agent.(They,ll just replace the whole board).If this Item is under warranty you should not be wasting my time.:::Spiceweasel.au

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1 Answer

GE spacemaker Profile XL1800 vent fan will not shut off


It may be a bad door switch, a loose door switch mount, or a problem on the control panel, such as a sticky relay.

I would suspect a sticky relay first, but the door switches should be checked.

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, linked here on Fixya: http://tinyurl.com/yzjozk

If you need your control panel assembly (smart board) repaired, we do that for $39.95 nationwide.

You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

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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.

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