MEP001
Well-known member
Can you draw a "map" of how each pump is plumbed, where any check valves are what solenoids are in place and what they do, etc.?
Do you know if the pumps are fed with city pressure on rinse? If so, there should be a check valve in place to prevent that pressure from backing up into the soap tank, and one of those check valves could be bad or sticking intermittently.
Do you know if the pumps are fed with city pressure on rinse? If so, there should be a check valve in place to prevent that pressure from backing up into the soap tank, and one of those check valves could be bad or sticking intermittently.