Thermostat problem on 1 zone
I've tried to research other posts as much as possible to figure this out but I have a few specifics with my situation.
I have 4 heating zones on my forced hot water system. All four work except the third floor, which just had a bathroom put in and the thermostat moved to another wall. The pipes are notorious for getting air in them and need to be flushed every so often, and I had to do this with the other three zones recently when turning on the heat for the year. I did this for the 3rd floor zone, and I feel the pipes filling with heated water, but it doesn't seem to be making it to the third floor. The dial thermostat clicks, but nothing comes on. I checked the connection of the white and red wires, which seem to be making contact. How should I trouble shoot this and what should I check next?
Thanks so much for any help.