I had the F01 error but the circuit board was fine. Eventually after taking the back and sides off the dryer I noticed the light came on every time the dryer stopped. Then I figured out that the door switch was the problem as pushing the door in made the light go out. So in the end all I did was add some sticky velcro to the switch to pad it out enough to make contact with door to keep the switch closed when the door was closed. Hope this helps someone.