• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

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970C85353310 blowing fuses when not in use.


Feb 14, 2022
Model Number
Sears Kenmore
1-5 years

For the past six months or so, we would occasionally go to use this microwave and notice that it was dead. It would trip the breaker on the breaker panel when not in use.

Then three weeks ago, the microwave was again dead. It was not the circuit breaker but the internal 20A fuse, which I replaced.

Now, three weeks later, same thing. I just changed the fuse again.

This microwave works perfectly fine. The fuse blows when it's not in use!
I'm sorry but I've never heard of such a case. Usually the only time the internal fuse would blow is when the high voltage circuit was energized (ie. when trying to cook). Also, a problem in the microwave would usually blow the internal fuse not trip the house breaker.

Try putting something meltable into the oven when not in use and see if it is affected the next time the fuse blows. That might indicate if the HV circuit was indeed being powered, to help narrow possible causes.

Dan O.

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