During an electrical storm we had a power surge. Our microwave (above stove type) will not heat now. Everything else works, clock, lights, etc., except the high fan setting. Low fan works ok. Can the microwave be saved or is it trashed? We just bought it in October, 2009.
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The low voltage brownout let the oven draw too much current, and likely an internal fuse failed. Typically after removing a dozen Philips screws you can take off the cover and locate the fuse, which you can match and replace. [If it still has "power" (like the lights come on) but has stopped heating, then it could be any number of other issues (main capacitor fail, etc)] I've changed a fuse or two in my day, and years ago a failed capacitor, with success.
Disconnect the microwave from the power source while the power is still
out. If the microwave is a built-in, turn off the circuit breaker.
Otherwise, unplug the microwave from the wall outlet. This prevents a
power surge from damaging the magnetron tube when the power is restored.Turn on the circuit breaker or plug the microwave into the outlet only
when you are sure that the power is permanently restored. If there are
still storms in the area, the power may be disrupted again.
Reset the clock on the microwave. Microwaves vary slightly on how to set
the clock, but usually there is a clock button you press. Use the
number pad to input the correct time and press the clock button again to
Test the microwave by heating some water to ensure that it is still in good operating condition.
You might try pulling the plug on the unit and leaving it overnight. The electronics may have locked up due to irregular voltage during the failure.
There may also be a GFI (ground fault interrupter) on that circuit that has tripped for the same reason.
Check the kitchen outlets for a tripped GFI.
Inexpensive fix yes, but quite dangerous as you have to either replace the High voltage Diode or the magnetron depending on what has gone. Most often it is the Diode as that is fed a few thousand volts and anomolies such as a surge in current cause it to blow(popping sound) You can also check the fuses and if lucky it is just a fuse, but a fuse very seldomly just blows as it points to an underlying fault such as magnetron , capacitor or Diode. Have a service man attend to it unless you know what you are doing as you are dealing with lethal voltages and current even after the microwave has been switched off.
Usually there are 3 or 4 mounting bolts located in the floor of the cabinet above. First you will have to disconnect the power and then the duck work if the unit is ventde to the outside. To remove the unit requires two people, one to support the unit and the other to remove the bolts. If you are doing it alone, quite difficult, you'll have to juryrig a deadman support. Ther is a wall plate behind the unit that has a lip that the back bottom of the microwve is locked into. After the bolts are removed slowly lower the front until you are able free the unit from the lip of the support plate.