I am not sure I can solve your problem or perhaps you have already solved your problem. My thought is "are you sure your circuit Breakers are OK"??? In order to re-set a tripped circuit breaker you have to first turn them all the way off, then re-set them to 'on'. If you did not do that they probably did not re-set.
Assuming you did that correctly then I would have to suggest you contact firstname.lastname@example.org. He/they might know of a internal fuse or other problem the may help you. Good luck.
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The circuit breakers may both be functioning properly. What might be happening is that both circuits have other current drawing appliances on them. The circuit breakers react to the sum of all of the currents drawn by all of the devices on that circuit. So, if you have a 15 amp microwave and an 8 amp refrigerator on the same circuit, you would overload a 20 amp circuit by 3 amps.
There are a couple of safety thermostats in the oven to shut down power if something overheats. One is on the magnetron tube (the microwave source), the other is on the cooking cavity. These sometimes go bad. There's also a power line fuse that may have failed, or become loose in its mounting clips. These can be tested with an ohmmeter; they should all measure very close to zero ohms if they're good.
Another possibility is that the control circuit board in the oven may have failed. I have worked on several Sharp ovens where the power transformer for the board has gone bad for no good reason. If the board goes bad the oven may appear to be dead as well.
Microwave servicing is best left to professionals. If you're thinking of keeping this one, take it to a service shop (or call for home service) and get an estimate. Then decide whether to repair or replace.
Hope this has helped a little. Thanks for using Fixya!
The problem may be an electrical one. Microwave ovens require a lot of power. Often, they use most of the power available to the circuit they are plugged in to. If there is not enough power in the circuit to feed the microwave and whatever else is plugged into that same circuit the fuse will blow or the circuit breaker will kick off.
Go to your electcical box, and check the breakers or the fuses. If one of the breakers has kicked, reset it by pushing it all the way off and then back on. If the fuse is blown, unscrew it and screw in a new one of the same amperage.
IF YOU HAVE THE MICRWAVE PLUGGED IN AND THE CIRCUIT BREAKER TRIPS IMMEDIATELY WHEN SET,
CHECK THE DOOR HOOKS THAT TRIP THE DOOR SWITCHES. BOTH SHOULD BE SPRING LOADED. THERE SHOULD BE TWO HOOKS ON THE DOOR. IF O.K., CHECK THE DOOR SWITCHES. THERE ARE AT LEAST THREE. IF ONE OF THEM IS SHORTED CLOSED,
THE MONITOR SWITCH WILL CAUSE A DEAD SHORT ACROSS THE FUSE. THE FUSE MAY BE HOLDING BETTER THAN YOUR CIRCUIT BREAKER.