I have a 3 zone boiler system that is managed from one thermostat. To tell why is a long story of an old house where I found that all three zones were wired to this mid-level zone. We were to be out of the house for awhile, so the t-stat program was overridden to allow the temperature to temporarily drop. Upon resuming the schedule, the middle zone is not distributing heat. The other two do distribute heat.
The two valves that are not using their mercury thermostats appear to be in the "open" position based on the "open" text that I see on the dial. The middle one does not appear to read "open" or "closed" and is not easily rotated. All three devices are labeled white-rogers
1311-102 3/4" .4A 25 VAC.Does the system need bled? If so, is that something easily done? The pipes from the three valves are all warm/hot to the touch, but for some reason the water does not seem to be circulating through the middle zone.
Of course, being Saturday in a NE snow storm is limiting my options to call someone over.
Any advice on what it may be and/or whether it is something that is easily fixable?
Thank you, Dave