I have a Kenmore Microwave Model #: 665.69619991. The first problem I had was the microwave was not heating up anything that was placed inside. Everything else still functioned. So I decided to research online on what the problem could be. I read that it's possible that one of the door switches could have gone bad.
So I opened the door of the microwave and looked at the switches. While it was still plugged in I pushed the bottom switch to engage it (the top door switch was disengaged.) The microwave shut down completely. No lights, no display, no beeping when you touch the buttons... you get the picture. I thought I either blew a fuse or tripped the main circuit breaker. I tested the outlet with another electronic device, it was fine. This tells me the problem is inside the box.
Advice is needed and most welcomed.
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Re: Wasn't heating food ... Now won't turn on.
We have critical safety information, door switch information, and disassembly information at our site.
You can access it through our listing here on FixYa: http://tinyurl.com/yzjozk
The purpose of the middle "monitor" door switch is to blow the fuse if the upper or lower switch gets activated with the door open.
So you'll also need a fuse now, certainly.
You may have originally just had a bad door switch, but there also may be a problem in the high voltage section.
Most typically a bad connection at the magnetron or a bad magnetron.
You can find exploded views of the microwave and affordably order parts here http://tinyurl.com/gv383
Or you can order parts from Sears via http://www3.sears.com
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Chances are that is just a defective top or bottom door switch or its mount. See our help file on door switches here. Also, that model number does not show up as a valid US Kenmore model. Please check the tag in the cooking cavity or elsewhere n the oven and let us know if you need further help.
simply stated.. if it fails to cook.. you may have either a bad magnetron tube ( that's the part that generates the microwave energy that cooks the food) or the filament transformer feeding that magnetron is bad. In either case.. you're probably better off replacing the entire appliance than repairing it.. Hope that helps...