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How can I fix my GE Microwave, model no. jes636wd 001?

Initially about 15 seconds after applying power to the microwave the display reads pf, then after about 1 minute f4 and then four beeps.

Now when power is applied the display reads only PF. Please help.
Carvin Haywood, February 2007
MY microwave wont heat what could be the cause
model GE #jes636wd 001

Jim, October 2009
I think "PF" means "Power Failure" and "F4" means "open humidity sensor". I found error codes on this site:
http://www.geappliances.com/service_and_support/faqs/faq_microwaves.htm

tex, October 2008
What happens when you unplug it for a minute or so then plug it back in?

Can you set the time?

It may be a bad keypad, a problem we can fix on the smart board, or a bad megnetron (if it gets scrambled while it's cooking).

William E Miller † MicrowaveDisplay.com, March 2007