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Microwave will not heat

The microwave will not heat and it makes a loud buzzing noise

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  • Anonymous Mar 26, 2008

    is this worth repairing

  • Anonymous Sep 14, 2008

    I have the same problem with my Sharp R-1492 manufactured in Feb 1999. It's now 9 years old and has had much use. I am going to just buy a new one rather than repair it.



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  • Microwave Ovens Master
  • 8,820 Answers

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:

http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html

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

Posted on Mar 16, 2008

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microwave_diode.jpg Power Diode

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.

picturena.gif High Voltage Capacitor

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.

microwave_magnetron.jpg Magnetron

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