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Boiler return line - ghost flow
Hi all have a bit of a strange hearing issue going on. Seems when Zone 1 is on zone 2 gets very hot. However when Zone 2 is on zone 1 does not get hot at all. The system has taco zone valves the guts for zone 2 were changed out thinking it was stuck in open position but problem continued. Also zone 1 and 2 have separate supply lines and zone valves. But only one return line as shown in the circle in the drawing. So I think we have a “ghost flow”. I think zone 1 return instead of flowing to the basement reverse flows into zone 2.