Question about Microwave Ovens

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Fan Stuck On.

When I run the Microwave the fan stays running after it is done cooking. When I hit the vent/fan button the fan slows down a little for high then goes back to high when it is on low or off. The only way to stop the fan it is to unplug the unit but the next time you use it it stays on again after it is done.
Also, I just tried it, when it is off and I hit the Vent Fan button it stays after I hit off. This is a new unit. It has a manufacturing date of Oct 7th 2007. I am not sure what the GE warranty is.

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  • ROCHOME Sep 23, 2008

    Microwave fan will not stop running after warming is complete. Must unplug to stop the fan.

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2 Answers

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You should have a one-year warranty on parts and labor and then a 5-year part warranty on the magnetron.

It sounds like the hood fan thermostat is flaky, or there may be a shorted relay or diode on the control panel.

But I would definitely avail myself of warranty service.

You can get your manual here: http://www.geappliances.com/service_and_support/literature/

GE Customer Service is at http://www.geappliances.com/service_and_support/contact/

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Posted on Apr 08, 2008

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I had this problem. I solved it by removing the controls and tapping on the Main relay, which was stuck closed. I tested with a meter before and after. I works now, but who knows how long. either way, it's a cheap part.

Posted on Mar 18, 2012

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1 Answer

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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Microwaves fan and light on permanently


One of the relays is stuck. Hit it firmly and see if the fan turns off

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Ge pvm2070smss shuts down


It may be a noisy magnetron if the failure occurs in a second or two of hitting "Start" to begin cooking.

See this FixYa solution. even though your model number is different.

Otherwise, if the internal cooling fan is not running when you are cooking, it will shut down after 30-60 seconds or so and stay off until it cools back down.

Also see http://www.microwavedisplay.com/jvm2070.htm

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Fan is barely running. during cook, fan runs weak and vent fan does not run. tech said maybe a control panel? i can do the work but need a parts and service manual. are these available? does the weak...


probably a defective motor or slipping blade. i'm not sure how old your amana is. if it's the real old chrome metal '70's or early '80's vintage models, the part may not be available anymore.. they were very common to fail.

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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

Cooling Fan stays on until the door is open


May be a sensor or thermostat for the fan thats faulty therefore it runs all the time.

Sep 16, 2009 | Jenn-Air JMV8000 Microwave Oven

1 Answer

Exhaust fan


Is the light on?
Things that it could be.
Could be a door switch.
Or it could be a stuck fan relay
Or worst odf all it could be a bad Timmer Keypad board. Not worth fixing because they cost to much.

Jan 14, 2009 | GE JVM1542 Microwave Oven

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

The fan starts up and runs on its own and we are cooking


That is a normal safety feature.

That's only covered in a very subtle note in the hood fan section of your owner's manual:

NOTE:If the temperature gets too hot around the
microwave oven, the fan in the vent hood will
automatically turn on at the HIGH setting to cool the
oven. It may stay on up to an hour. When this
occurs, the fan can not be turned off.

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

Enter your model number as MV1610ST with no spaces.

You will need the free DJVU viewer to view or print your manual.

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

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1 Answer

GE JVM1870 Spacemaker Microwave Fan Malfunctioning when Cooking


There are two different fans in this model, as with almost all over the range microwaves.

One is the hood vent exhaust fan, which you can turn on and off at will, and which should always be on when cooking on the stove top.

This fan does not automatically come on when you cook with the microwave.

The fan which should always be on (automatically) when you are microwaving is the internal magnetron cooling fan.

If the cooling fan fails, the magnetron can overheat and the thermal cutout (TCO) / thermostat will open, killing the power to the oven. Ideally, this protects the magnetron from being destroyed.

If the thermal device is a thermostat, it will reset when it cools down, and the oven will work.

If the thermal device is a true thermal fuse, it is a one-time device and if it blows, it will have to be replaced.

If your cooling fan is bad, it needs to be replaced before using the microwave.

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.

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