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I just ran 20 feet of new baseboard in a basement. The home owner had the supply and return already stubbed out for me. It is a 3 floor Home. Basement main floor and top floor. There are two zone valves on the system. And a new thermostat was installed for the basement by his electrician. With the thermostat set at 66 in the basement we are only reaching 62, and the thermostat on the main floor is off and yet it has reached 81. I believe this is because the zone valve for the main floor is defective. And the boiler is trying to satisfy the basements thermostat causing th main floor to over heat and preventing the basement from reaching temperature. Before I change the zone valve I was hoping to get some of your opinions. Thanks in advance