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I am aware of the requirement for a by pass however this rad can not be turned off manually as this results in the boiler turning itself off for safety reasons but the pump is working 24/7 and the rad is always hot thought this hasnt always been the case. I am sure we were told when it was...

thanks for the replies guys. Changing the valve cured the C/H prob. However it didnt cure the 1 hot rad prob. Having checked the pipes again I find that the hot water comesfrom the pump, it then can go through either of 2 valves (I assume for hot water or C/H) or through a branch pipe. This...