Question about Sharp R-303CW Convection / Microwave Oven

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Food does not heat but lights, turntable, etc run. I

At first the problem happened now & then. Now nothing heats on any of the cycles. Thanks for your hlep. The unit is 6 years old.

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Is it louder or quieter than usual?

I would suspect a loose or corroded connection at the magnetron or a bad magnetron.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/mag_test.html (continuity can be good even though it is bad!)

The best place to order Sharp parts is Tritronics. You can also call them at 866-779-5835

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Nov 21, 2008

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