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Interlock switchIf your
microwave is turning itself on, the first thing to check is the
interlock switch. This is usually the first thing to malfunction that
could cause this issue. If the interlock switch is bad then it will need
to be replaced.
Main control boardIf
your microwave is turning itself on and the interlock switch is still
working, the probable cause is the main control board. If the control
board is defective it will need to be replaced.
It sounds as if you key pad is sticking. PF means that there is an input power problem but could be caused by the sticking keypad.. As far as the unit starting bu itself, the only thing that can cause that is the keypad.. Try running your fingers flat across the panel several times both vertically and horizontally and see if the pad malfunction clears. It will probably repeat in the future but you could get lucky and have a one time instance. The keypad itself is just a bit over $75.00 if it has failed. Good luck.
First, do not leave this machine plugged in until it is serviced. If this is a KHMS155LSS, there is a very high probability that you have a keypad short. This defect can cause the machine to start on its own at ANYTIME, at night, while you are away, at work etc. Contact Whirlpool Customer Service and ask for Safety Dept immediately. They will most likely send A&E out to fix it. Although it will fix the problem, if the keypad fails again, the self start logic defect is still present. You should be under warranty if it is above model. I almost had a fire this past Monday, Labor Day, 9/7/09 when my machine self started at 3 AM with a package of bacon left in to thaw for the morning. What a somey mess. Chinese made garbage.
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/