On Tue, 23 May 2006 22:14:01 +0100, "Roger Mills"
wrote:

Could be an air lock or a blockage. First, make sure that there is water in
the F&E tank if it's a vented system - or that there's sufficient pressure
in the system if it unvented. Then re-bleed the offending radiator twice -
first with one valve fully open and the other closed - and then the other
way round. [You may have to clamp the pin of the TRV down to close that
unless you have a manual cap for it - or just refit the thermostatic head
with a spacer above the pin, and turn it to minimum]. Bleed a couple of
pints of water out each way. This will ensure that *both* pipes are clear
and free of air. [If you bleed it with both valves open, one pipe could be
blocked but it will still bleed].

Thank you so much for the help. I will try the above as soon as I can.

Al D