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Mark Brown Posted on Dec 14, 2020
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Model 790.80373310. Why does the fan randomly turn on and off?

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Tom Chichester

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  • Kenmore Master 62,329 Answers
  • Posted on Dec 16, 2020
Tom Chichester
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Could be a defective fan or control board malfunction. Another possibility is a defective door interlock

2 Related Answers

MicrowaveSvc

William Miller

  • 9179 Answers
  • Posted on Dec 15, 2008

SOURCE: JVM1850BH02 Microwave completely shut down, not working after...

The extreme heat has opened up one of the thermostats / thermal cutouts (TCOs) in the oven.

If it was the bottom TCO or magnetron TCO, you should be able to access them by just removing the control panel.

But if it's the one on top of the cavity, the oven will have to come out of the wall, then you need to pull of the outer cover..

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download GE owner's manuals and installation instructions 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.

You should locate and look this over first.

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.

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

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

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Anonymous

  • 574 Answers
  • Posted on Aug 31, 2009

SOURCE: Internal cooling fan on microwave will not turn

could be a bad sensor

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Related Questions:

0helpful
2answers

The vent will turn on randomly and not turn off!

Most over the range microwaves have a heat safety system built into them. If for instance you are cooking on the stove top for a long period of time on the burner directly under the micro control panel and the control panel get too hot, a thermostat in the microwave will automatically turn on the vent fan to help keep the control panel cooled off. My guess is that the safety thermostat (usually right behind the bottom of the control panel) may be going bad and needs replaced.
0helpful
1answer

The oven has trouble ligting,and make,s a boom sound when lighting

Magnetron


If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.

Enter your model number to see parts for your microwave.

Help me find my model number
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Exhaust Fan Motor


If the microwave is loud when running the fan motor might be

Enter your model number to see parts for your microwave.

Help me find my model number
picunavailable175.jpg

Stirrer Motor


If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.

Enter your model number to see parts for your microwave.

Help me find my model number
picunavailable175.jpg

Turntable Motor


If the microwave is loud or noisy the turntable motor might be worn out. This is a common problem and relatively easy to replace.
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0helpful
1answer

What causes a Samsung Microwave exhaust fan to turn on by itself?

mine turned exhaust fan on automatically... i couldnt shut it off... had to unplug it.... no buttons worked.
0helpful
1answer

I hane a Galaxy over the range microwave model # 721.80002401. The problem is the fan randomly turns on and will not go off unless I unplug it.

May be a defective fan switch or the unit is detecting some heat there--not likely to be a do it yourself repair--consider having a shop look at it for you---
0helpful
1answer

The fan turned on randomly and will not shut off

A make & model number would help...There could be a number of possible causes. The overheat saftey, depending on the make & model this senses ambiant heat on the frame / chassis, the door sensing interlock switch. Depening on the make & model the control board fan relay. All these could be shorted closed. Depening on how the fan switch is wired the on / off switch or the routing through the control board might be at issue. If the unit has a schematic it may help troubleshoot the issues.
5helpful
1answer

FAN WONT SHUT OFF

My Kenmore microwave oven fan has been turning on and off, almost every hour. Sometimes 3 or 4 times in one hour. It's very random. Model No. 721-80593401 Serial No.503TA03208
Please help!!!
7helpful
2answers

Kenmore 721 microwave fan turns on by itself

I have the exact same problem with my Kenmore Microwave model 721 that we bought in October of 2005. The Fan will just randomly turn itself on even when we are not cooking. It has been doing this for the last few months and is starting to become more frequent. There is no way to turn it off except to unplug it for several hours.
Was there a recall for this defect ?
0helpful
1answer

LMVM1935SB - Over the Range LG - fan keeps coming on, beeping

The fan will come on if you are cooking below and the area gets hot.... is this when it happens? Sometimes random beep could be a power blip... not long enough for a reset of all things electrical
0helpful
1answer

GE Spacesaver Microwave interior fan shuts off randomly

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

It is vital that the cooling fan runs, or the magnetron will be destroyed.

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

Can you post a video clip with sound?

Otherwise, please reply back with your brand and model number so we can help you.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

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

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

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

0helpful
1answer

The fan comes on randomly.

alot of newer microwaves have a feature that if you are cooking on your stove and the bottom of the microwave gets hot it will turn the fan on to help protect the microwave. if thats not the case the you could have a faulty control
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