Microwave not cooking

Microwave Repair
1

Good day,

As you can see from above I have a GE JVM1190BY002 Microwave/Convection oven. This past weekend it stopped cooking via the microwave. I have found other posts online for this microwave that it could be (most likely) one of five things, i.e., the diode, magnetron, HV capacitor, thermostat, or door switch.

The exact symptoms are that the display, clock, keypads work fine. When I go to cook, the light inside turns on, the display starts to count down, etc., but BOTH the fan and the magnetron don’t seem to be running.

When it first occurred it was after cooking carrots in water and that worked fine, but the next thing in didn’t cook. When we let it set overnight it worked ONCE in the morning, but since then no luck at all.

This leads me to believe it’s the thermostat. But given the age of the microwave, the fact that a new one would cost me over probably $1k, and the fact that if I have to take it down and repair it, why not replace the components that are most likely to give me grief in the foreseeable future.

So I’m looking for help in choosing what parts to purchase, say, just for preventive maintenance.

There are three thermostats on your site. I’m assuming the "Thermostat?Magnetron" is the right one to buy (PN WB21X536). What other parts would you recommend?

Thank you!

3

Thought I’d follow up on this myself. I took the microwave apart, found a schematic in it, and from that it was pretty clear that the symptoms I described above were either a thermostat or the door switch. I focused on the door switches first. If you’ve ever used (most) microswitches you know they have a characteristic "click" when pressed. Two of the three had this click, but the third did not. I pulled one wire off to check it with a multimeter and sure enough continuity did not change as closed and opened the door.

I was actually able to fix the switch without buying a new one. One of the contacts had just enough play in it that it had prevented the switch from functioning. I pushed it back to its original place and the switch started operating fine. A little superglue (carefully applied) should hold it in place into the future. However, FWIW, it can be replace with door switches from this site or other (PN WB24X829) should I (or someone else) need to in the future.