Question about Kenmore Microwave Ovens
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Posted on Jan 02, 2017
Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.
The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.
There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.
Posted on Apr 26, 2009
A failed diode isn't the most common failure, but it happens. And sometimes it's due to bad magnetron or a bad connection.
If the capacitor fails, it almost always shorts, which results in a blown fuse whenever you hit "Start" to run the microwave.
The magnetron on this model should have a 5-year warranty, in case that's relevant. Your owner's manual is here.
We have the service / repair manual for this model and have uploaded it to our site here to help you.
It will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.
Here are some links you or someone you know can use for test help, but read their safety warnings first:
(if it's not shorted or burned, it's probably okay)
There should also be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.
At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.
You can find helpful exploded view diagrams and order parts here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Jun 30, 2009
SOURCE: Microwave does not heat
There is also very likely a fuse for the magnetron circuit as well. A failed magnetron could well destroy the diode that supplies the high voltage DC for it.
Posted on Oct 17, 2009
Replace the magnetron and high voltage capacitor and diode and you wont have any issues. Make sure you clean any burned carbon residue from the area where the mag tube is installed.
Posted on Nov 13, 2009
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