Question about GE JVM1840 Microwave Oven

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Mircowave works, exhaust door opens, fan stop working

Turn mircowave on to heat food. Heats up fine. Exhaust fan door open to vent but the fan does not come on, you can hear a humming or clicking noise in the background. When the fan is turned on via the circuit panel on the front, fan turns on and when the fan boost button is pushed it also blows out faster like it is suppose to do. What would cause the fan not to work under the normal use of the mircowave in use only?

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Re: 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: (or the better URL here: 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.

Posted on Nov 01, 2006

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We changed the charcoal filter & reset it. The vent fan still does not run. I cannot turn the vent on by pressing the vent button but the micro still heats up. What happened to the fan?

follow this steps and fix iT. God bless you

  1. Exhaust fan motorIf your exhaust fan motor is not running, there are a couple of things that you can check involving the motor to locate the problem. After removing the fan motor, you can manually attempt to turn the fan blades with your hand. If the fan motor is working properly, the blades should spin effortlessly. If this does not occur and the blades are taught, the motor will need to be replaced. Secondly, the fan motor itself can burn out due to time and usage. Using an ohm meter, the exhaust fan motor should read open for continuity. If it does not, then the fan motor has expired and will need to be replaced.
  2. ThermostatAnother part that could cause the microwave exhaust fan to not work is a faulty thermostat. A thermostat gauges the air temperature, which activates the exhaust fan when required. If this part becomes flawed, the exhaust fan will not energize and the thermostat will need to be replaced.
  3. Main control boardIf your exhaust fan is still not working and the microwave fan motor, wiring, and thermostat are operating accurately, the root cause could be with the main control board. Replace the main control board.

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Sep 30, 2013 | Whirlpool WMH2175XVB Microwave Oven

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JVM3670sk6 mircowave over the range, vent door continues to open and shut when oven is off

It may need a reset. You can do that by unplugging the power for a minute or two, then plugging it back in and setting the clock.

If it still fails, you may have a failing sensor switch in the vent fan / louver assembly or a damaged component.

There should be a technical sheet hidden behind the grille or behinds the controls. It's very handy to locate and test components.

You can find a video here that shows you how to remove the grille & controller in about 5 minutes.

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

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Fan is loud and almost sounds stuck and the food does not heat at all. Now it died all together. No lights on. Is it worth fixing?

From your the description the magnetron has failed, "heats food" the exhaust fan has seized which keeps the magnetron cool when running, and finally the main fuse has opened, It is far cheaper to replace the microwave oven than repairing it.

Jun 19, 2011 | Jenn-Air JMV9169BAS Convection Microwave...

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Mircowave turns on but does not cook food food does not get hot all other options on oven work fine

you have a bad magnetron . that is the heating source . the part is not cheap. go to sears parts direct and check out the price b4 you have someone check it.

Feb 27, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

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Whenever I open the door on my GE Spacemaker XL mircowave the internal fan goes on. This is the fan that goes on when the unit is cooking and not the exhaust fan. It goes off as soon as the door is closed...

That is normal for it to spin for about a second or so becuase of switch changeover but should not remain on constantly when door is open. Have it checked up if it does not happen like the way I described it.

May 13, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

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GE Mircowave JES2251SJ -

The internal magnetron cooling fan is located behind the control panel assembly.

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.

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

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.

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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If we close the mircowave door the units start to run by itself. - it will not heat, but the light comes on and the turntable rotates it will not stop until we turn the power off - when power is turned...

i think you have a welded controller, either a digital one or a mechanical one. microwave won't run unless you switch it to run. the door switches are safety switches to turn off the microwave once you open the door. if you have a digital controller, you could have a welded relay, if you have a mechanical timer, it could be a welded contact at the timer. another thing is that it should heat what ever you are heating. if it is not heating, check if it has a fuse and if it is busted. some fuse are installed to protect only the magnetron that is why the light and turn table are still running. if there is no fuse to the magnetron, then check the diode from the capacitor to the ground. it could be open. if not then you can have a bad magnetron. i hope i was able to help.

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Jan 07, 2008 | Maytag MMV1153A Microwave Oven

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Mircowave oven stopped working

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose conneciton on the control unit circuit board
- bad magnetron or other high voltage part

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya:

Oct 27, 2007 | Microwave Ovens

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