Why is one boiler zone cold when the others work?
A single cold zone may involve its controls, circulation or the way heat reaches that part of the home. A boiler that starts does not prove every zone is receiving heat. Tell us whether the thermostat is calling for heat and which radiators, baseboards or floors stay cold. Avoid changing pressure settings, opening hot components or trying to bleed an unfamiliar system. We assess the affected zone and the boiler together.

