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Possibly a bad oven temp sensor. If the uinit doesnt read a temperature it will shut down to prevent a fire or over heating. The temp sensor is a thermister A temperature variable resistor that changes value as the temp changes. so If the main board doesnt get a response within a vertain resistance range it shuts things down. Sometimes since those parts are in the actual cooking area and subject to the heat and steam from cooking they can rust and break, or just get old and break. Or slam the door and break, you get the idea!!
If it sparks inside the oven then look inside for any powder paint missing... if so discard. If you has metal shelves or tin foil then don't put metal in when on microwave setting. Some of these metal shelves are for a microwave that is also a convection oven but only in the convection oven setting.
I'm a GE tech, the F7 means there is either a stuck button on the keypad or relay on the board behind the keypad. Shut off the breaker. Remove the 3 screws under the keypad and lift the panel a bit to remove it. Lay it face down on the top rack and disconnect the ribbon cable. Turn power back on and if f7 goes away the problem is in the keypad. If f76 returns it's in the control. We typically replace both together because usually if you replace 1 it will come back later then be the other part.
Most F7 codes are saying the keypad is sticking. Try running your fingers flat up and down across the keypad then horizontally multiple times and see if the F7 code clears. You cna verify this if you unplug the unit and then plug it back in. There should be a pause of about 16 seconds then the F7 code will appear if it is in fact a keypad problem.
Assuming it's a Panasonic type with an inverter, If
it stops after 22 seconds, that means the controller has detected a
problem, usually a problem with the inverter,
controller, magnetron, or a bad connection from one or the
Due to the lethal
voltages used and produced in inverters, I do not recommend that an
inexperienced person work on these.