Loud humming when powered
Assuming your inside light and turntable come on when you try to microwave, I would most strongly suspect a shorted high voltage rectifier
diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.
If you or someone you
know
decide to look into it, we have critical safety information and
disassembly information at our site, and our link is at our listing here on FixYa.
There
should be a "mini-manual" (tech sheet) hidden inside the unit
behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating components.
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.
Here are some links you
or someone you know can use for test help, but read their safety
warnings first:
http://www.gallawa.com/microtech/diode.html
(if it's not shorted or burned, it's
probably okay)
http://www.gallawa.com/microtech/mag_test.html
If it's within the magnetron portion of the warranty (5-9 years)
but out of the original full warranty (1 year), G.E. will cover the part cost, but not the cost to visit you or
the labor charge to do the work.
Sometimes they will
send you the magnetron to do it yourself.
If nothing else, you
can save about $50-75 if you remove it from the wall and take it to a
GE-authorized servicer.
You can find a
GE-authorized servicer by calling GE Appliance
Service at 1-800-848-7620 or here.
Accessing some components for testing and possible replacement will require you to remove the oven from the wall.
If
so, the installation instructions are very handy, and it's best to have
two people since the microwave can be heavy and awkward.
You can download GE
owner's manuals and installation instructions here.
We're happy
to help you with free advice and we'd appreciate your thoughtful rating
of our answer.
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Loud humming when turned on. Fan works, light works, doesn't heat.
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