Question about Microwave Ovens
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Posted on Jan 02, 2017
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 conneciton on the control unit circuit board
- bad magnetron or other high voltage part
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, linked here on Fixya: http://tinyurl.com/yzjozk
Posted on Nov 25, 2007
Is the internal cooling fan working?
Are the ducts and vents clear?
Problems with any of those can result in overheating, which destroys magnetrons.
I have seen high voltage rectifier diodes interact with magnetron in funny ways. I'd replace the diode, too.
You can find links to helpful exploded view diagrams and part ordering help here.
I recommend that you bookmark that link to your favorites.
Finally, baking potatoes and making popcorn really give the magnetron a workout.
You should put about 1/2 cup of water in the rear corner of the microwave when cooking those foods.
It helps "preload" the oven to prevent execessive microwave energy reflection back to the magnetron.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Dec 18, 2011
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