Question about Microwave Ovens
It's likely a blown fuse or TCO (aka thermal cutout / thermostat).
Yours should have a "mini-manual" (technical sheet) hidden either behind the grille or control panel. It's very helpful in locating and testing components.
There is a video here showing how to remove a typical over the range control panel assembly in under 5 minutes.
Accessing some components (especially the oven cavity thermostat) for testing and possible replacement will require you to remove the oven from the wall and take off the outer cover.
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.
You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.
Posted on May 04, 2013
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Posted on Jan 02, 2017
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