We had a small fire inside our microwave and now nothing works. No display, nothing.
I read this thread on a similar GE model, but the P/N suggested there doesn’t seem to correspond to mine. That thread recomended replacing the ‘cavity thermostat’, but there is nothing called that in the diagram for mine. There are three different items called ‘thermostat’, but I’m not sure which, if any, is the one I should be looking at.
The fire was on the left of the cavity, below a grille in the top of the cavity. The ‘sensor-gas’, item #51 on the diagram, is behind that grille. I initially thought that was likely the thermostat in question, but it doesn’t seem like it.
Can anyone point me in the right direction as to what I ought to test and how to test it?
Ok, I did a continuity check on items #85 & #79, the ones I could easily reach without pulling it off the wall. #85 showed continuity, #79 did not. Does that mean #79 is my problem? Should I need to test #51 too? If so, how since it seems to have 4 connectors?
Pulled it off the wall so I could check thermostat #3. Found it had continuity. So, for the two with continuity I unplugged them one at a time and plugged the MW in to see if removing the continuity changed anything. It did not. I placed a jumper wire on the one without continuity and all that did was turn the vent fan on, no control panel or anything else.
Looking around up top by that ‘gas sensor’, I discovered what looks like another thermostat, in the same location as that other thread mentioned in the first post. It’s not listed as a ‘thermostat’ in the parts list, in fact I can’t find it on the diagram at all. It tested no continuity and when I jumpered the wired the MW came back on. Now I just need to figure out what it is so I can order one.
Not that anyone is paying attention to this thread 
but the wiring diagram in the unit calls it the ‘oven thermal cutout (flame sensor)’, with a ‘SEC PARTS NO.’ of DE47-20196A and a ‘GE CAT - NO.’ of WB27X10195. On the face of the sensor is:
KSD1
NM2
100/
There’s nothing on the parts page with the words ‘oven’, ‘thermal’ or ‘cutout’.
Maybe it’ll help someone else.