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Sharp R-345M microwave oven not heating. Touch pad is working fine and the turner is spinning.

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If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

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)

Since the turntable is running, I would say it is not a door switch problem.

If you or someone you know 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.

If you prefer to call for service, please visit http://www.sharp.co.uk

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

Posted on Jul 13, 2008

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