Cold rad and pipes, new system

[Hitch11]

Have a brand new CH system. All working fine apart from one rad which is cold. Pipes to and from it also cold. Is there a valve or something I need to turn to activate that rad?

Would normally call builder back to fix it, but am currently in legal dispute with them.

[2face]

shut all the rads off appart from the cold 1 .. let it run till both pipes are red hot .. equal temp..

also check the valves are both open ..

if there is a trv on the rad remove the top and check the movement of the pin ..

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plumbing,heating,solid fuel and electrical services.