Question about GE XL1800 1100 Watts Microwave Oven

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Reversed polarity a problem?

We just realized the polarity of the outlet that feeds our microwave was reversed. Can anyone hypothesize on whether this could be leading to HV problems? The MW produces a loud humming/buzzing, no heat. The dome on top of the magnetron shows some charring. Have replaced magnetron once already.

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The polarity won't matter to the normal functioning, but to ensure safety in case of a short, it should DEFINITELY be corrected.

You probably have a bad magnetron (again) and possibly a bad high voltage rectifier diode too.

GE had a campaign (but not a recall, mind you!) covering several models.

Details are in their bulletin at

The parts kit (that GE used to pay for) is part # WB27X10489 and is shown in the photo below.

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:

You can find helpful exploded view diagrams and order parts by entering your full model number here:

Chances are GE won;t cover any of this, but just in case you want to contact them, GE Customer Service is at

We're happy to help and we appreciate your thoughtful rating of our answer.

Reversed polarity a problem? - b09f57c.jpg

Posted on Jan 20, 2008


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Your high voltage power diode has most likely failed. That or the magnetron itself has failed where as the oscillator is stuck. My bet is the power diode is what has failed.

First off short out the capacitor AFTER removing the outer chassis with a screwdriver. Hold the screwdriver back on the handle and short across the 2 capacitor terminals. Locate the power diode that will be the wire that is metal. Remove it from the capacitor. Use a meter and read continuity of the diode. Reverse the test leads and read continuity again. In one polarity it is supposed to read like a wire (ZERO Ohms) and in reversed polarity it is supposed to read infinity. (Open) If you get open or short in both directions it has failed.
Diode PN is:

You can change this part and still have a problem with the magnetron... usually though a diode change brings them back to life.

One more thing to do is check the capacitor.... you probe the terminals with the meter on R x 10,000 and watch for a brief jump in resistance and then the meter drifts to infinity. Reversing the leads your looking for the same result each time you reverse the test leads. If you get this reading... the capacitor is probably good.

Thanks for choosing FixYa,

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