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GE manufactures various models of microwaves with a range of features. Among them is a child safety feature that allows parents to lock the keypad. Though children can still open the door, the keypad lock prevents them from starting the microwave. The lock is in the form of a keypad code that renders the buttons inactive.
* 1 Press and hold the "Clear/Off" button on the microwave's keypad. * 2 Hold the button down for three seconds. * 3 Wait for the "L" on the keypad's display to disappear and display the time instead, signifying that the device is no longer locked.
The F3 error code for a GE microwave means the control is sensing a stuck or shorted key. Try pushing every button multiple times and do it firmly.
Hold a blowdryer in the corner of the keypad then slowly move it down as you peel it back (but not off). Take a sponge with the tiniest bit of dish soap and run it over both the sticky part (back of the circuits) and the place it is stuck to. Blowdry this til touchably dry and then reapply the kaypad face. Wait about 10 minutes until you plug in again for it to cool off.
If that doens't work, UNPLUG the unit and try to gain access to the electronic control board. If you can there may be a ribbon cable you can unplug from the board and try wiping the end of the cable hard between your thumb and index finger then wipe with a paper towel and reinsert the ribbon cable. May work but more than likely you will need to replace the touchpad.
F3 means a problem with the keypad. A bad keypad may be worn out due to age, damaged, or it may have gotten wet or otherwise contaminated.
Moisture and contamination can be caused by not using the hood fan when boiling on the stove top, spraying of cleaners, by storing the microwave in an unheated garage or shed, or infestation.
I warn my customers to never spray cleaner directly onto the microwave keypad, since the liquid can get inside and "lock up" or even ruin the keypad or controller.
Apply an alcohol-based cleaner (such as the purple kind) to a cloth (paper towels can scratch) and gently wipe it off.
I suggest to my customers that they NEVER use any ammonia-based cleaner (like the blue stuff) on a microwave, since the ammonia will crack and distort polycarbonate plastics.
An exploded view and parts price list can be seen by entering your *entire* model number at the GE parts Web site: http://www.geappliances.com/shop/prts/