The rad is either switched off; or it has a blockage in it...
Ensure "BOTH" ends of the rad are turned on... If you have thermostatic rad valves, then the likelihood is that the valve has got stuck in the closed position; to free it; remove the head and you'll see a small pin - You need to tap this pin (Sometimes quite hard) to create enough vibration on the spring to get it to release and pop up.
GasAid.co.uk
December 2006
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