Question about GE JVM1850 1000 Watts Microwave Oven
A hard reset would be the first thing I'd recommend, but unplug it for about 2 minutes, plug it back in, and watch to see what it does.
Wait at least 60 seconds after powering it up to see if an "F3" code comes up.
You can download GE owner's manuals and installation instructions here. See what it says about a demo mode.
Otherwise, I would suspect a shorting keypad.
If you need more help, we can let you know what your options and costs would be and send you other helpful info.
At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.
Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
William E. Miller, AS-EET
Microwave Oven Control Panel Repair Nationwide
Posted on May 06, 2010
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Posted on Jan 02, 2017
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