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Help with heating outage in gas-fired hydronic baseboard system
We're in the midst of a cold snap here in Boston and my girlfriend's heat suddenly went out. She has a gas-fired hydronic baseboard system with a Burnham boiler and Taco circulators. The system has two zones, and one zone is working fine. The other has no heat. The local heating service folks have been out twice and say it is fixed, but the heat doesn't come on. They replaced the pump and purged the system and told us it's probably a frozen pipe.
The boiler is firing, the lights for both zones are on and the pipes right at the furnace are hot for both zones. Both the outgoing and return pipes become abruptly cold at the first elbow in the pipe as it leaves the furnace to cross the basement, and all the baseboards are ice cold.
We've spent the afternoon warming up pipes with a hairdryer and space heaters to no avail.
Suggestions? Tips for what I should say when I call the service tech back?
Thank you !