I report from owner manual.
F3 means : Short circuit on key panel (your touch pad).
You get F3 error if a shorted key panel is detected for more than 60 seconds.
Solution: . Replace key panel (touch pad).
Try first unpluggign power cord for five minutes.
If you think that the problem may had been caused by water inside the keypad you can try using an hairdryer on the keypad, taking care not to melt the keypad plastic.
If that does not work, then replace the keypad.
You can buy replacements here. or Order GE Microwave Ovens Parts Here
Error Code/Message - Oven - F3 Error Code - F3 E0
Control displaying F3 E0:
There may be a problem with the Oven Temperature Sensor, or the associated wiring.
Power unit down by turning off the circuit breaker(s) for one (1) minute.
Power unit up by turning on the circuit breaker(s).
Monitor the oven for one (1) minute to ensure the error code does not display again.
Verify oven operation.
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