Just wondering if anybody can help. I have recenlty moved a radiator in one of the rooms in my house. When I re-filled the rads and started the central heating systems up all the rads worked except one. It was working fine before draining down and doing the work. I have made sure that the rad is bled and there is definitely water in it. If I turn on the central heating and then draw off some water by the drain valve by the rad, hot water is supplied to the radiator and everything heats up as normal. As soon as i shut the drain valve the rad then starts to cool down. Does anyone have any ideas as to what may be causing my problem? Just as a footnote I have a fully pumped vented system.
Cheers
Cheers