it goes through the child safety sequence. locks the door, cold water for a few seconds, unlocks the door then is just sits. sometimes it works, sometimes not. i searched the forum and saw where someone posted the tech sheet then ran the diagnostic. when i reported the error history it showed F22, F28, F20. i don't know if those are old errors or recent. is there a way to clear the error history? F22 is the door lock so could this be an intermittent door lock problem or is it likely the ccu?

greg