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Taco 571-2 Zone Valve Issue
I have a Taco 571-2 Zone valve that seems to be malfunctioning. The zone control is lit red for Zone 2 and there is no flow of hot water. If I switch the valve to manual, I do get flow. Is it possible that just the head of the valve is bad??? By twisting the valve to remove the head, will there be any water loss??