JE520WC001 General Electric Microwave

Turned out the issue was easily solved by replacing a single, inexpensive fuse.

First off, UNPLUG THE MICROWAVE.

The fuse is located under the plastic grill at the top of the microwave. It's held on by two screws. Once you've removed the screws and taken off the plastic grill, you go to the right side of the mic ... Read more rowave and remove another screw that holds a small metal grill in place. Removing the small metal grill is probably the toughest part of this repair. You kind of have to rock it back and forth a bit to get it to release. Once that's off, you can get to the fuse. I removed the burnt out one with a pair of needle nose pliers. I also put a small piece of cardboard under the fuse when I did this so I didn't accidentally drop it into the innards of the microwave. I did the same thing when I replaced the new fuse. I then plugged the appliance back in and made sure it worked. Once that was confirmed, I replaced both grills.

found fuse blown and heat damage to TCO sensor.

Removed microwave from enclosure and removed cover, hoping it was as simple as a blown fuse. Found extremely helpful diagnostic sheet thoughtfully provided by manufacturer in an envelope affixed to top of cavity. Fuse was fine, but tracing the power feed into the machine revealed that the oven cavity thermostat was open--no continuity acr ... Read more oss it, and the diagnostic sheet indicated that it was non-resettable. Verified the issue by temporarily by-passing the blown thermostat to ascertain that the front panel display got power. It took longer to get the screws for the cover and enclosure back on than it did to replace the thermostat, once I received the replacement part. Microwave works just fine now, thanks!