Question about Microwave Ovens
The microwave will not heat and it makes a loud buzzing noise
That is usually a shorted high voltage rectifer diode, but it may be the magnetron.
It would be helpful if you reply back with your brand and model, but here is a good answer that should help you:
You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
Here are some links you or someone you know can use for test help, but read their safety warnings first:
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Posted on Mar 16, 2008
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Feb 03, 2016 | Whirlpool Accuwave Microwave Oven
Oct 10, 2012 | GE Microwave Ovens
Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
A diode is an electronic component that readily
passes current in one direction only and blocks the flow of current in
the opposing direction. If your microwave's diode has become defective,
your microwave will not heat and you will hear a buzzing noise. Test the
diode to determine if this is the cause of your problem. Replace it if
it is defective.
A capacitor is an electrical device which stores
electricity. A defective capacitor may be why your microwave is not
heating but you are hearing a buzzing or humming noise. The capacitor
will have to be tested to determine if this is the cause of your
problem. A defective capacitor will have to be replaced before your
microwave will work again. Make sure you discharge the capacitor before you test it, though.
A defective magnetron is the third possible cause of
why your microwave is not heating, but you can hear a buzzing noise.
Test your microwave's magnetron. Replace it if it is defective.
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