It is all of a sudden beeping and there is a -F3- in the screen area. What do I do. It is a above the stove microwave. And has never done this.

probably a defective keypad

Possibly a sensor error.
There is a temperature sensor that is giving the wrong voltage to the control panel.

So far so good we unplugged the machine took the filters off the bottom let everything dry out over night and it seems to be working I'll update you tomorrow. I think the steam got the control pannel wet.

I have the same problem. However when I unplug the microwave from the wall outlet, let it sit for 10 seconds, then weird codes appear on the top line. Reset the clock and it shold work just fine.

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f3 code temp sensor circuit bad ,f2 oven temp higher 500 degrees

The error code F3 indicates an oven sensor problem. The oven sensor is most likely the failed part. The oven sensor probe must have the correct resistance readings at specific temperatures. When the electronic range control (ERC) cannot identify the correct resistance of the oven sensor or the resistance is way out of specs F3 will display.
I recommend calling a service technician to diagnose and repair your oven.

f3 problem

This answer assumes that the new keypad is the right one and that it is plugged in correctly.

F3 is normally a bad keypad, but it may be debris or residue on the circuit board in the area that the keypad plugs into, or there may be some corrosion on the connections of the keypad connector.

Look for whitish or dark green deposits on the circuit board. These may be mineral deposits or tarnished copper due to moisture.

These are most common if one cooks on the stove top without turning on the hood vent exhaust fan.

Feel free to post a good close up photo or two of any area you suspect.

Feel free to contact me directly for more information & help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. Miller
[email protected]
http://www.microwavedisplay.com

The code f3 is a short in the key pad for more than 60 seconds
go to GE .com and enter your model # and you can get a price to do it your self
Good luck
TEETERMAN

microwave quits working and F3 comes up on the readout - along with a series of beeps - pressing any of the buttons on the touchpad does nothing - The F3 stays there and beeps intermittently