Testimonial: "thanks for reply , confirmed that it was not user repairable."
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It is most likely one of three things, magnetron "heats food" cracked high voltage diode, or a shorted high voltage capacitor. I recommend a professional to assess, chances are cheaper to replace microwave oven.
I too was getting the "Vent Fan Off" message, and despite the fact that everything else worked fine with the microwave, I turned the breaker off and back on from my electrical panel. The fan works fine now.
I have the same unit and age the JMC7000 everything appeared normal on the display and countdown etc...But it would not heat,I trouble shooted the problem and discovered it was a faulty door switch I replaced it and it works like new again.I ordered the part from www.repairclinic.com it's an easy fix.and costs a few bucks...