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Runs ,wont heat - LG Microwave Ovens

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Posted on Dec 30, 2010

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Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

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1 Answer

Wont heat


If the diode is good (not shorted) then I would suspect the magnetron.

Here are some tests that might help:
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html


We\'re happy to help and we appreciate your thoughtful rating of our answer.

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