Might be the power controller but equally might be the eht diode, transformer or capacitor or the magnetron itself. If you have the experience you can test for mains output from the power controller to the transformer but checking the eht circuit is best left to the experts as getting it wrong can be fatal.
You will find plenty of information about this on youtube and other question/answer sites. Try an internet search...
SOURCE: MICROWAVE OVEN
Bad power diode, bad power capacitor or bad magnetron
Google on 'microwave not heating' and you'll get some sources of information
SOURCE: GE Spacemaker Microwave JVM165OWB005--No more heat!
If you look at consumer affairs.com, there are many problems like this with GE microwaves. Not a good track record, experiencing problems with mine as well.
SOURCE: ge spacemaker xl microwave oven turntable
You can see and hear a video of how a turntable motor should sound when you rotate it by hand.
If
yours is not set to be off via the control panel, and it won't rotate
or it sounds like it's grinding, etc., you may have a bad motor or
plastic coupler.
To
replace either, you need to unplug power, then remove the bottom cover
of the oven.
If yours is a GE, you can usually find helpful exploded view diagrams and order parts by entering your full model number here.
If yours is a GE, there
should also be a "mini-manual" hidden inside the unit behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting & testing.
We're happy to help you and we'd appreciate your
thoughtful rating of our answer.
SOURCE: My Ge SpaceMaker XL1800 Microwave Oven won't power on any more.
1.Check power outlet for working.
2.If it is than you have broken fuse inside the m/w.
3. To change the fuse you have to disconnect the power to m/w, take the upper grill off, take the screw on top of control panel, lift the control panel up and removed. The 20 Am fuse located behind this panel.
I’m happy to help further over the phone at https://www.6ya.com/expert/vitaliy_f406165329c75ede
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