SOURCE: microwave no heat
The "HUMM" indicates a breakdown in the High Voltage Side. The loud "POP" was the breakdown. You have only four Components in the High Voltage side.
1. High Voltage Transformer. You can eliminate this as the problem. Why? If it was the problem it would have blown the line fuse, and would have given off a burned transformer smell.
2. High Voltage Diode. Usually will Burn or Pop when shorted, but will then OPEN the Circuit and there is no "HUMM".
3. High Voltage Capacitor.This is the Silver Can with the two terminals on top. It can SHORT internaly between the plates (the two terminals) and give the "HUMM".
4. Magnetron. This is my number one suspect. A SHORTED Magnetron.
SOURCE: KENMORE MICROWAVE (HOUSEHOLD) LOCKED
It sounds like you press STOP two or three times to lock it. Maybe that (or another key) will unlock it.
The lock / unlock procedure will be covered in your owner's manual.
Or you can try a hard reset - unplug it from the wall for one minute, then plug it back in and try again.
If you don't have your manual, you can get one here. (Enter your model number without any spaces)
We're happy to help and we appreciate your thoughtful rating of our answer.
SOURCE: Start button on microwave does not work
Some numbers are missing off that model number. Would that be model 721.62622200?
(If not, please reply back with the correct model number off the tag)
If it's cooking with the programmed buttons, but Start is not working, it sounds like the keypad has failed.
The keypad for model number 721.62622200 is no longer available as a separate part.
So you'd have to buy the entire controller assembly, which includes the plastic frame, keypad, and circuit board, etc.
It is part # 4781W1M307A and it runs $110.10 at the Sears parts Web site.
We're happy to help you and we'd appreciate your
thoughtful rating of our answer.
SOURCE: Kenmore microwave 721 Displays 66:66 and beeps
Try first unplugging power cable for ten minutes, and see if it clears the error.
SOURCE: kenmore microwave model 721-63252301 - no heat
we are going to try to find a fuse and replace that or just buy a new microwave
thank you
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