I have a problem with one upstairs radiator not warming up. I drained the system a few months ago, before doing this the radiator warmed up ok. I have tried bleeding it with no success and i have ensured the thermostatic control is also ok. The radiator is full of water but the pipes from either side of the radiator are cold. I suspect an air lock, can anyone give me any advice how to overcome this problem please?

Phil, February 2009

try turning off all the radiators bar that one.
or if you have a thermostatic rad valve it could be stuck in the off postion.
if all else fails youve got a blockage in your pipes

liam, February 2009