Hello sweetenfamil.
Smackin' it still works! For an intermittent problem like yours, I've often tapped around on the inside components to see if I could duplicate the complaint. And that's just what you've done, except from the outside. I would say you have either a failing door switch, or a loose connection. Put a cup of cold water inside, set the timer for 1 minute and start. The first thing you will hear is the cooling fan come on. After about 1-2 seconds you,ll hear a deeper tone/hum. That's the magnatron coming on. If you don't hear the mag, pull down slightly on the door. If nothing, lift up slightly the door.If either of these starts the water heating, it is probably a failing door switch, or bad switch alignment. If the door wiggles don't work and only hitting it starts the mag, then it's probably a loose connection that your jostling.
To check and tighten the connections, the unit would have to be taken down and the outer cover taken off ,as they're not all accessible from from the front. If it is the door switch or alignment, those can be accessed through the opening behind the control panel. But that will be a fairly long write, so try the door moves first and see if that is the fix. If it is, get back to me and I'll walk you through the rest. You will need a test meter and some hand tools.
Good luck.
fil
If your GE microwave sounds and LOOKS like its heating, but its not, and its almost new, I found the HIGH VOLTAGE PLUG going into the magnitron was burned. I cleaned it, (scraped off the burned metal surface) and pushed it back on to test it ~ WALLA ~ WORKS LIKE NEW!
So, replace the cheapo connector with a high voltage/stainless connector. A bit of silicone to Insulate. Let it dry, and were off to the races.
"smacking it" - and having it come on, was the first sign of HV issue. SURPRISINGLY, I couldn't smell ozone from the arc... Anyway, 60 cents aughta fix it!
Lance...
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