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Many microwaves have similar issues. Usually, (not always) only the light is on and the fan is running, not the section that produces the microwaves. This problem can be caused by the door switches that are out of alignment or a defective control board.
A mains surge may have taken out the fuse. To find the fuse, remove it from the mains, remove the outer cover and follow where the power cable enters the case. There will be a PCBoard with a fuse on it. Always replace the fuse with one of exactly the same type and value!
Press "Power" until you get to the level you want. Then enter the # of minutes on the keypad (CANNOT use express cook times.) An alternating runnig hum will let you know the setting is working.
If these switches fail (do you open the door while the machine is cooking?), the microwave doesnt know the door is shut and will not turn on the magnatron.
It could be an overheating magnetron. There is a thermostat inside (mounted to the side of the magnetron) which senses excessive heat and opens up, disconnecting the power to the oven.
If that's the case, unplugging it and plugging it back in will not fix it. It will come back on by itself after it cools down. That's another indication that it might be a thermostat kicking out.
You might try to further characterize the failure:
- happens only when cooking on full power?
- also happens when cooking on a low power level?
- shuts down every time you use it?
- only shuts down after XX amount of time cooking?
Once you characterize it more, I can make further suggestions.
It may also be a bad connection on the control panel.
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