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Everything on the microwave works (e.g., turntable lights, controls, etc.) except it will not heat food, defrost food etc. It sounds like a magnatron. Any Ideas before I call a tech? Is there a online manual?

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  • Microwave Ovens Master
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It does sound like the magnetron, but you need to check the high voltage capacitor and diode because they can be the problem. I don't know if there is a online manual.

Posted on Apr 10, 2011

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If everything is working normally, except for heating, the likely cause is the magnetron.  Microwaves can be dangerous to work on, as the site below points out.  If you have an ohmmeter, it is possible to check the magnetron, but be certain to follow the precautions outlined at the webpage:
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Here is a video of how a turntable motor should sound when you rotate it by hand.

If yours is not set to be off via the control panel, and it won't rotate or it sounds like it's grinding, etc., you may have a bad motor or plastic coupler.

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You can find links to helpful exploded view diagrams and part ordering help here.

But if you've recently had trouble with the cooktop lights, then the control board may be damaged.

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Microve turns on, but will not heat Model number is FMT148G1B2 Everything seems to work except there's no heat. Clock works, countdown timer, light, turntable, etc., just no heat.


Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


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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...

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I think its the mag tube, mine went out the same way. GE will provide the mag tube for free just call them...have a local ge certified tech out to put it in.

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