It seems most times flo control valves get stuck open and then you have the zone too hot due to runaway heat. I am wondering if mine is stuck closed cause the radiant heat in that zone never reaches temperature (70 degrees) and thus the cirulator is always running. The other 4 zones upstairs with baseboards are working fine, pressure is at about 17lb. and boiler temp is at 180 degrees.
It seems that the hot water pipe going into this flow control valve is hot but the pipe out of it is not. I am very worried to try to open it manually since the valve is original 1961? If in fact its stuck closed, if I try to bleed this zone, would nothing come out of the purge valve located on the return since the flow control valve is closed?? Any input is greatly appreciated!!