A contractor had to drain and cut part of my two-zone forced hot water
baseboard heating system to do a bathroom remodel. He said he bled the
lines, purged them of air, then refilled the reserve tank with fresh
Upon firing up the gas boiler, the system was loud and the upstairs
zone was extremely slow to heat. He said this was because he couldn't
get all the air out of the upstairs baseboards (said there were no
purge valves) that the water had yet to heat up to the proper
temperature. He suggested we let it sit overnight and try it again.
Today the noises are gone, but there is now no heat in either zone. One
of the two circulation pumps gets quite hot, the other only tepid, but
no heat flows into the baseboards
Any help would be appreciated!