Question about GE Spacemaker JVM1640SJ Microwave Oven

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Bearings on the cooling fan for the magnetron have let go; squirrelcage has been scraping and now has seized. Can fan be replaced? It appears to be imbedded in a sealed case. Ian

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The whole UNIT must be replaced for reasons of safety. There has been a malfunction of the magnetron or it had been used on a wrong program for the excessive heating.
confirm the cost and replace.

Posted on Aug 30, 2010


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Related Questions:

1 Answer

Spontaneously stops working and then comes on after 5 minutes. Why?

Sounds like the magnetron is overheating. There is an automatically-resetable thermal circuit breaker attached to the magnetron. Most likely your problem is caused by either a cooling fan that is not running, or is running too slow (caused by gummed-up bearings). In some over-the-range (OTR) microwave ovens, the exhaust fan is run at a slow speed to cool the magnetron, and if it's bearings get gummed up, it won't run on the slow speed. But if it's a new OTR microwave, then the exhaust fan may be pointing the wrong way. (It is rotatable, depending on the installation). For example, if it is pointing up, but you don't have an exhaust vent over the microwave, then the air has nowhere to go, and the magnetron will overheat.

Oct 16, 2014 | Microwave Ovens

1 Answer

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...

1 Answer

When the Whirlpool microwave oven is on the loud fan noise is unbearable. It is not effected according to the power level, in fact when it stops cooking the noise remains until it automatically is switched...

The fan motor is going and it involves bad bearings or the lubrication in the motor has dried out. The fan is responsible for cooling the magnetron while it is running and is critical, I suggest replacing it as quickly as possible.

Mar 07, 2011 | Whirlpool MH7140XF Microwave Oven

1 Answer

First the motor cooling fan quit working and then it was running without the cooling fan working and everything shut off. It is as if it is unplugged.

The cooling fan protects the magnetron from overheating when it is running, the magnetron has probably been damaged and has shorted due to the excessive heat that they generate and blown the main fuse in the microwave to stop any further damage. The repairs for parts and labor will not be justified and replacement in the long run will be cheaper.

Jan 24, 2011 | Frigidaire FMV156DC Microwave Oven

1 Answer

Same problem

your oven shut down because the magnetron got too hot (has a resetting thermal switch) .. it needs a constant and high flow rate of cooling air .. there is a fan that blows air over the magnetron fins ... sometimes the plastic frame that holds the fan becomes warped or broken .. the fan then doesn't deliver enough air to where its needed ... the squeaking noise however may indicate that the fan blade is either hitting the frame or the bearings in the fan motor need lubricated ... the fan is most likely the problem .. you can replace it or Lube it and repair any broken mounts .. make sure the fan turns freely and is aimed correctly .. use a light machine oil (intended for very small motors) or sewing machine oil .. not wd40 or oil with teflon .. your magnetron will be damaged if it continues to overheat .. you can gain access to the fan by removing the cover but do so only with the power disconnected and taped so no one can plug it in while you are working .. when plugged in there is potentially deadly voltage and current available inside .. . there are indeed two fans .. the vent fan and the magnetron cooling fan .. the loud laboring noise often happens if the magnetron is shorted or if the high voltage diode or voltage doubler capacitor is shorted ... but since your machine is still working until it gets hot i suspect those are not he problem yet but may be eventually damaged without cooling air flow .. that model GE did have problems with the fan mount and that in turn damaged some magnetrons ... the lube in the fan bearings generally is reliable up to 5 years depending on use .so that could be the problem as well

Jul 29, 2010 | GE JVM1440 Microwave Oven

2 Answers

Oven will not heat but turnstyle and other features operate ok.Is there a fuse that can be replaced?

several of the GEs i have worked on with your symtoms turned out to be bad magnetrons ... if the magnetron gets too hot then it will go bad .. you can get it really hot by running it without anything in the oven .. but several of the failures were caused by a fan mount failure ... there is a fan that cools the magnetron .. it is mounted on a plastic framework .. if the plastic breaks or distorts then the fan is not aimed in the correct direction .. the air goes around the magnetron instead of thru it and it fails to cool the magnetron ... so in these cases the fan framework was repaired and a new magnetron installed .. often that repair costs more than a new microwave oven .. there are other things that will cause the same trouble .. a high voltage diode, a capacitor, a transformer, a relay and a high temperature cut out switch ... the cutout automatically resets once things cool down but it can go bad .. the cost of some of these things is not high but labor often dictates the repair vs replace decision ... magnetrons cost a lot unless you have connections .. .at any rate you dont want to be powerering the microwave when its taken apart .. with the cover off there is potentially fatal voltage and current avalible by just touching the wrong thing .. ..

Jul 02, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

We have a model # mmv1153bas over the range microwave. When heating or cooking items longer than a couple minutes the unit shuts off and remains off for at least 1 hour. It is not the breaker or the plug...

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

An overheating magnetron can be due to:
  • operating oven without cover(s) in place
  • wrong magnetron installed in oven
  • an old or otherwise failing magnetron
  • cracked magnetron magnet
  • improper power line voltage (should be 110-125VAC)
  • foods low in moisture (popcorn & bacon, e.g. - add 1/2 cup of water in rear oven)
  • failed or inoperable cooling fan or hood vent exhaust fan
  • deteriorating foam weatherstripping seals in air ducts or on outside cover
  • blocked air vents (dust, animal nest debris, insufficient free air space behind & around oven, etc.)
  • clogged or greasy charcoal filter or grease filter
  • blocked duct in hood vent exhaust
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. Repeated shutdowns like this are endangering the magnetron, assuming it's not bad already.

Your owner's manual will cover checking the filters and will cover warranty terms. The magnetron may still be covered.

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

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

William E. Miller

May 25, 2010 | Maytag UMV1152BAS Microwave Oven

1 Answer

My microwave stops goes dead after running for 2 minutes

It may be that the magnetron is overheating. The main causes:

- blocked air vents
- blocked air outlet or duct (if an over the range type)
- clogged grease filters needing to be cleaned
- clogged charcoal filter needing to be replaced
- failed internal cooling fan
- failing magnetron

Depending on the model, it may have a thermostat on the magnetron so that the power is killed if it overheats, then it comes back on when it cools down.

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

Please listen to that and compare it to yours. You may hear that your cooling fan is not running.

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 turntable and stirrer won't work, and magnetron will soon be destroyed.

If instead the microwave starts microwaving then it scrambles and then comes back up as if someone unplugged it for a couple of seconds and you can set the clock and start again, then you have a magnetron that is leaky.

Once you listen to that and check your vents, filters, etc., let us know what you find so we can take it from there.

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To allow us to help you effectively (at no charge), please post a
NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, and your detailed symptoms, as well as the results of these recommended checks.

Dec 12, 2009 | Samsung Microwave Ovens

1 Answer

My GE microwave JVM1860 is dead, no power. I checked the electric outlet and the fuse/breake panel. Nothing.

One of the most common problems with Ewave microwaves is a loose blade on the cooling fan, causing the magnetron to overheat.

At this time looks like the magnetron, the magnetron TCO and the fan blade have to be replaced.

Aug 29, 2009 | GE Microwave Ovens

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