Question about Sharp R-320H Microwave Oven

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Microwave will not heat

Everything works but it will not heat. How do I get to the fuse

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  • Sharp Master
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Since everything else works, the fuse is not blown.

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

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

Posted on Feb 27, 2008

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  • Master
  • 579 Answers

Check the internal fuse. Unplug it, unscrew and take off the cover, the fuse should be easily found in the back by the power cord. It looks like a regular fuse but is white instead of clear glass because microwave fuses are special. You'll have to measure it with a meter as a result and be sure to replace it with the same kind. (try finding them at radio shack) Hopefully there isn't something more serious also. The high-voltage parts the (high-voltage capacitor and diode) are suspect. These parts start to break down due to the stress on them and draw more current. The excess current will usually make the transformer noisy until it gets to where it blows the fuse.
Hope ya fix it!

Posted on Feb 11, 2008

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