I have a ge built in microwave model # JK90BM2BB but won't heat

Sounds like a bad magnetron tube.

Click link and download Manual:
https://www.geapplianceparts.com/store/parts/assembly/JNM1851DM2BB

There three area's of concern, magnetron, "heats food" the high voltage diode, "sometimes crack" the high voltage capacitor, "usually shorts"

GE Will replace the magnetron for 9 years! Mine is a 2004 model with a one year warrently according to manual. HOWEVER they did say the magnatron was covered for nine years: call 888-239-6832. When I called they said thats all they get calls for and would send out in 3-5 days. NO CHARGE. I had to ask if there was coverage longer than a year on major parts and that's when they offered the info and I eventually was transferred to the right office. Saved $120 bucks on parts alone.

Chances are the magnetron has failed, "heats food" the other possibility is the high voltage capacitor and diode. Repairs will approach the cost of a new microwave oven.

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
r

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
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Magnetron is done. This part heats the food. GE microwaves tend to have them stop working quite frequently. They basically make up the majority of the cost of the microwave, so instead of replacing the magnetron, you would be better off getting a new microwave.


Benjamin

It's most likely the Magnetron. The are not very easy to install and quite expensive. Older models magnetrons cost about 80 bucks from GE. It's probably not something you would want to try and repair yourself. Call a GE service person.