You should still have about a 5-year warranty on the magnetron, if that's the trouble.
If everything else works, it's almost certainly a high voltage component, most likely the magnetron or diode, but also possibly the transformer.
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/yzjozkI would contact LG / Goldstar first. For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit
http://www.lgservice.com.
We're happy to help and we appreciate your thoughtful rating of our answer.
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