There is a thermostat which detects when the temperature from the cooktop is too high, and it makes the hood vent exhaust fan come on to cool it to protect the controller.
That's I always recommend
that you use the vent fan whenever you're cooking on the stove
top to keep heat, steam, and
grease out of the controls and door panels.
Assuming the wall outlet is good, the
first thing I would suggest is a hard
reset. Unplug the unit for a
minute or so. Then plug it back in, set the clock and try again.
If that doesn't work,
leave it unplugged for about 5 minutes.
If it's still dead, another thermostat may be blown,or the fuse.
You can find links to helpful exploded view diagrams and order parts
here.
I'd recommend that your bookmark this link to your favorites.
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.
Usually the fuse and magnetron thermostat will be accessible for testing behind the controller.
If those are good, then it may be a bad oven cavity thermostat, and checking that will require you to remove the oven from the wall and take off the outer cover.
Behind the controls in many microwaves is a technical sheet, which helps in locating and testing components.
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