The dryer keeps beeping and reads PF

The dryer keeps beeping and reads PF

dryer keeps beeping and reads pf

ANSWERS:

Just had the same problem! What happens is those white buttons on the right sight of the dashboard getting sticky inside, so when I pushed very right one it stick on, so I just got smth sharp and pull the button back out! Problem solved! With time buttons getting sticky underneath and when you push it on it sticks on and not coming back out