Do the inside light and cooling fan come on when you press Start?
If so, the problem is likely to be in the high voltage section.
If not, then the problem is likely to be related to the door switches or possibly the controller.
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 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:
http://tinyurl.com/yzjozkYou can usually find helpful exploded view diagrams and order parts by entering your full model number here:
http://tinyurl.com/gv383Your model may also have a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.
We're happy to help and we appreciate your thoughtful rating of our answer.
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