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Have a 5 zone hot water system, Honeywell zone valves, One zone in a indirect water heater. Problem is
upstairs zone over heats when thermostat is not calling for heat. When checked the problem zone valve seems to be working properly. Also tried to purge air from system, very little air at the time, but does not seem like much water pressure when trying to purge air. Not sure if zone valve is the problem?