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Microwave problem how to fix Microwave running but not heat

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Re: Microwave problem

Magnatron is suspect. Need to put a voltmeter on the input (primary) side to the high-voltage transformer (big heavy iron thing in there) Should be getting 120Vac when it goes to cook cycle. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing either the magnatron or the high-voltage capacitor and diode. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!

Posted on Jan 04, 2008

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Microwave runs but doe not heat

follow this test and fix it. God bless you
  1. Check the power diode This electronic component is responsible for transmitting current in one direction. If the diode becomes defective it will cause your microwave to not heat. Test the diode and replace it if necessary.
  2. High voltage capacitor Responsible for storing electricity, this part is a key component in any microwave. Remove, discharge, and test the capacitor to determine if it requires replacement.
  3. Damaged magnetron Responsible for generating waves and producing heat. When your microwave is no longer heating properly, replacement will be required.
  4. Thermal Cutoffs Examine the thermal cutoffs on both the magnetron and the oven itself. Take off one of the leads and using a volt-ohm meter on RX1, check the terminals. If you get a result other than zero, replace the thermal cutoffs.

Nov 26, 2013 | GE JVM1190 Microwave Oven

1 Answer

My microwave is not heating the food. It is built into the walls of my kitchen in my condo/apartment. Can I fix this myself? How?

When the oven is running, does it make a loud buzzing or humming sound? If it does, then the problem is the magnetron, the part that generates the microwaves that heat the food. It not worth fixing since a new magnetron will cost almost as much as a new microwave. Ask your landlord that you need a new microwave oven. Sorry.

Jul 02, 2010 | GE Profile Spacemaker Over-the-Range...

1 Answer

Microwave runs, turntable turns, fan runs, but does not heat,

No heat means the magnetron circuit has failed. It is the part that generates the microwaves to heat the food. Usually not worth fixing since the magnetron costs nearly as much as a new oven. To diagnose, if the oven is on, you will hear a loud buzzing sound if the magnetron is shorted.

Jun 30, 2010 | Sunbeam SMW777 Microwave Oven

1 Answer

Microwave does not heat

your magnatron tube (what heats the food) is out, if it is not still in warranty it will run 200-300 to fix, might be better to replace sorry

Jun 08, 2010 | GE Adora DVM1850 Microwave Oven

1 Answer

Microwave not heating

The Magnetron has stopped working in this case and, you will need a replacement Magnetron heating device. this will fix your heating issue.

Replace the Magnetron. Runs about a 160.00 or maybe cheaper in most cases.

May 30, 2009 | GE Microwave Ovens

1 Answer

Everything works except heat

this is something you should probably call a repair technician for, due to the danger of the componentry.

Usually in ther case of this problem, even a technician will advise you to replace the unit, in the minds of cost effectiveness and safety...

Mar 21, 2009 | GE JE1540 Microwave Oven

1 Answer


I did more research along with the suggestion of an apprentice to have person to fix the microwave. I was unable to fix it myself. The microwave needs a magnetron .

Feb 03, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

Everything works except heat

Sounds like you've had a failure in the microwave portion of the unit.

Microwave not heating problems when the timer/controller board appears to function properly, are related to the following components -

1) Diode
2) Capacitor
3) Transformer
4) Magnetron

Jan 24, 2009 | GE JE1540 Microwave Oven

2 Answers


your magnatron needs replaced! (It may cost less for a new one then to fix this one!)

Dec 09, 2008 | Sharp R-930AK Convection/Microwave Oven

3 Answers

Microwave runs but does not heat--is is repairable???

I replied to your other post as well: It could be any multitude of issues from a faulty magnetron,a bad high voltage diode, a door switch issue or a faulty circuit board. A magnetron for your model is ~ the $60 area. A Circuit board is ~ the $100.00 mark. If your a wiz at electronics I would say give it a go and try to repair it yourself. Otherwise I would say that a new microwave oven would be your best bet. A technician may charge you up to $250 for the work they will do, bringing you to around the same cost of a new microwave with a warranty. Hope this helps. P.S. If you are interested in buying the parts and fixing it yourself, may I recommend this site: They are top notch and really helpful.

Jul 26, 2007 | Whirlpool MH1150XMQ Microwave Oven

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