[77newell]

Something like that certainly could be and somehow changing the tubing caused it to disappear. Logically that would require a chunk that somehow operated like a check valve since in the dump mode that side dropped as fast as the other side despite filling slower from the raise valve but filling just as fast from the travel valves. If it is debris I sure hope it is displaced forever, this was a real pain to figure out. I did learn a lot about the HWH system while working on this so all is not wasted, just my sense of pride.

Thanks for all that participated, exercising the mind supposedly delays dementia so we're all good for some time now.