Question about Microwave Ovens
This is the second time the heat stopped working on our microwave. It was built in 2004 and have had it fixed once before, but is no longer under warranty. Could I fix this myself? The model # TRR4273020.
Yes, I'm trying to help you. Sorry about all the questions, but it's part of diagnosis.
Generally, the most common causes of a failure to heat are:
- bad door switches or door switch mounts
- loose or corroded connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron
- shorted high voltage diode
At this point, it seems pretty clear that the problem is in the high voltage section, most likely the magnetron, but possibly the high voltage diode or transformer..
Here are some links you or someone you know can use for test help to find the defective component, but read their safety warnings first:
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Aug 06, 2008
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Posted on Jan 02, 2017
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