theaggie
New Member
I have hot water baseboard heating and for some reason the upstairs thermostat seems to be opening the zone valve but not turning on the circulating pump. The downstaris zones appear to work fine and when they engage the circulating pump, I get heat upstairs.
What is supposed to turn on the circulating pump? Does the thermostat have two output control lines or is there some other relay that turns it on? A schematic or wiring diagram would be nice.
What is supposed to turn on the circulating pump? Does the thermostat have two output control lines or is there some other relay that turns it on? A schematic or wiring diagram would be nice.