Report "I have a 3 zone hot water system, and 1 zone is not working.I've tested the thermostat and it worked fine. I then adjusted the wire caps leading to the zone valve making sure the wires were not the issue.I then tought that it might be that the valve wasn't opening.While the thermostat is asking for heat, the valve it does open but the circulator does not run.I don't know what else to check"