How to Troubleshoot F3 Problem on a GE Microwave

Unplug the power cord for the microwave from the electrical outlet. Pull the microwave out from the wall and set it on a table or the counter.

Find and remove the two screws from the top of the grille, on the font of the unit, with the Phillips-head screwdriver. Pull the grille off of the microwave.

Find and remove the screws that are used to secure the control panel to the microwave frame. Lift the control panel unit up and away from the microwave.

Find and remove the screw that is used to secure the green ground wire. Pull out all of the connectors and ribbon cables from the control board.

Apply heat from a hair dryer to the front of the control board for at least 30 seconds. Make sure the hair dryer is at the low setting. Pull up on one corner of the top membrane, then peel it off of the control board.

Repeat Step 5 for the other membrane that is on the control board.

Insert the pliable circuit of the new membrane through the opening in the control board. Remove the wax backing to expose the adhesive for the membrane. Place the membrane onto the control board.

Peel the wax backing off of the top membrane, then place it on the control board.

Place the control board back on the microwave and secure it with the screwdriver. Reattach the grille, and set the microwave back in place.

Plug the microwave back into the power outlet and reset the clock.