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If the control panel lights up intermittently, then you either have a loose connection somewhere near the panel, or a failing component on the circuit board itself.
Take the unit apart and carefully inspect the wires under the keypad...short of that..junk it and get a new one. It seems they just don't make things the way tey used to.
It may be a loose fuse holder or a rare condition, an intermittent fuse.
You can find
helpful exploded view diagrams and order parts by entering your full
model number from the tag on the oven here.
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.
There should also be a "mini-manual" hidden inside the unit behind the control
panel or hidden on the left side behind the grille, which is very
helpful when troubleshooting, & testing.
If you need further help feel free to contact me with your full model number and symptoms.
Please check all the poer connections on the power side, the magnetron section. specially the capacitor. Also if there is fault on the control processor board.
This can trip off the power and reset. possible loose connection or even if the outlet power - if it is lower when the microwave starts.
id say there is a bad connection somewhere and is arcing due to that which is causing it to trip breakers. so when you banged it and it started it made a connection and then stopped when you turned it on. open up the back abd just pull the wires anywhere connections are made and see if any are lose.
Well it does appear that you have an intermittent problem. I do not think that there is a loose ground problem, but there is a thermal switch attached to the case of the magnetron that resemble the thermal switches in wall gas heaters. Like the one in wall heaters they tell the heater when to shut off and on. If that switch begins to open or is trying to open it will make it seem like your microwave wants to shut down. Of course that is just one solution which I think is the best. By the way that thermal switch only has two wires that go to it and resembles an oversized watch battery when it is out. What could cause that also is if those two wires which are connected with plugin spade terminals have become loose due to the vibration of the magnetron over the years. To cover all your bases at once, with the power off, take the cover off and reseat all the spade connectors that you can see and get to. Anything in line with that switch or with the power coming in at all can cause the same thing. Let me know if there is any other question that you have.
Is not normal for a microwave to shutdown after 4 minutes of operation.
From the info you are providing, It looks like the magnetron might be overheating causing the thermal fuse to shut it down until it cools down. There may also be a loose connection in one of the switches or a cold solder joint in the low voltage power supply.
I would suggest to check and make sure that the fans are functional, If always did; it could be that there isn't much air circulation where the appliance was installed.
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