Kenmore built-in microwave 63662/... power just stopped
I just had a Sears repairman here to try to fix the microwave. It just stopped working and has no power. The repairman seemed puzzled and eliminated the obvious problems (fuse, connections, etc.). By process of elimination, he decided it must be the thermostat. He ordered a new one and will be back in about 1 1/2 weeks to install it. It will cost me a little over $200 to fix it. It is about 5 years old. Should I repair it or purchase a new microwave?
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The "lock" function is nice if you have kids who like to push buttons. It disables the microwave oven to prevent it from running unnecessarily, To disable the lock feature push the "STOP-CLEAR" button. Then press and hold the "START" button until 'locked' is no longer shown on the display panel. To re-lock it, do the same thing until 'locked' appears on the display. Have a nice day.
I had the same oven for one and a half years and had the same problem. Had the sears repairman come out and he said the magnetron burned out and needed replacing for $285. It was never under warranty with the warranty that came with oven. I couldn't believe it! We had an independent repairman look at it and he found a design flaw that causes the magnetron to blow. If you replace the matnetron (megnatron?) it will work for awhile, maybe, but then just need to be replaced again. It's cheaper to buy a new microwave. In fact, I got out our old microwave that's over 20 yrs. old and still works--just isn't as fast and as new ovens. Good luck!
To find helpful exploded view diagrams and get part numbers, you can just enter your full
model number 721.63664300 at the Sears
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There is also another item called a thermistor. This is as the name suggests a thermal resistor. This will be located across the air outlet for unit. If the unit overheats or catch fire it cuts the power also. You can get them at electronics parts stores like Radio Shack.
You can test these parts with an ohm meter to see if they are "open".