JES1290ML01 General Electric Microwave - Overview

I removed the plastic plug that held the wavecover in place and pulled the wavecover off. I replaced with new cover and it worked perfect.

Door microswith was stuck on. This is caused, I discovered, by frequently stopping the oven, while running, by opening the door rather than using the stop button. Causes the switch to arc and eventually fail. This causes the safety microswitch to trip the breaker when door is opened. There are little nubs sticking up on the spade connectors. You must squeeze them down before you can remove them from the switch. The main door switch is the upper one, mounted at an angle. You have to remove the latch assembly to remove the switch. The problem was obvious once I got the switch out. This problem could also blow the fuse, but in my case the breaker tripped first. Use an ohmmeter to check switch and fuse. The door switch is normally open. The safety switch is normally CLOSED. Instructions inside were helpful and described this problem. So, avoid this repair by always stopping oven with stop button!

The wave guide cover (wgc) are notoriously bad on this model. As far as I can tell even a little food that gets stuck on it combined with cooking small/insubstantial items will cause the wgc to overheat and catch on fire. Ordered a part from partselect, found it very easily on their site using a nice diagram and ordered it. The item came in two days and was a cinch to pop in and replace.