Hi,Welcome to Just Answer, My name is XXXXX XXXXX forward to helping you today.
have you tested the valve for power?
there is a mini service tech sheet in this did you find that?
what happened when you moved the knob one notch at a time, like did the hot water come in when you were at position 4 and so on? 8 would be high speed spin and I'm just throwing them out there did any of the positions active any of the functions?
so all the functions worked in diagnostic mode but none in regular mode?