Each ZONE of a Baseboard Hot Water system has a Zone Valve. It's in the cellar near the furnace. It's controlled by the thermostat up in the room, or area for that zone. The thermostat is not likely the problem. The zone valve in your case may be "sticky" or reluctant to function. As often as not.. just replacing the "Electric" part of the zone valve....a seperate component ON TOP of the mechanical valve itself fixes the problem
Hire a plumber and the cost goes UP. NB
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