The GE microwave continues to heat (cup of water gets hot) with a continuous hum after it has been turned off and door closed. The control panel does not respond. When the door opens, everything stops (no humming, no heat) and light comes on. This happened before and after a few days, the microwave worked normally. We could not find the schematics inside the control panel. What could be the problem and are there schematics available on line?
Thanks
Platypook
We replaced the control board as you suggested and the microwave is working properly again. There was an initial hum but it went away after we opened and closed the door. Thank you for you assistance - this was most helpful, and saved us from having to pay extra for a technician to come!