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Well I am going to answer myself. If the valve has power and you try to move the lever away from the "auto" side, it should be difficult to move and it will immediately wind back. This only applies to when the thermostat is off. If the valve does not wind back then the actuator is shot.

Hi all, I live in a home with 2 heating zones (hot water heat), and often the area where I live is getting hotter than the temperature I have my thermostat set at (often 6 degrees warmer). I am thinking maybe my zone valve is stuck open (the one on the left). So I just tried to do a simple...