Hi, I hope someone may be able to solve my mystery. I have one cold radiator on a combi boiler system. The other 6 radiators are nice and hot, but this one remains cold. It seems one side of the radiator is slightly warm but the other side (with the thermostat) is cold. I have read various posts on the forum and have taken the top of the thermostat valve and checked the valve, having done this the valve seems to be open but still no heat. Could the valve be sticking internally or be filled with "sludge". Any suggestions?
Many thanks
Many thanks