Cold radiator in attic

[kaj]

Hi, New to this forum, but parents have a radiator in a converted attic that hasn't worked for over a year.A friend suggested valve could be blocked? would this be the most likely cause?.
Any help appreciated.

 

[kevplumb]

see this

 

[meldrew's_mate]

KevPlumb is right, with so little information you are inviting guesses.

Here's mine!
Turn off CH & HW, turn off both rad valves. Try bleeding air out of the rad, air may come out. Open one of the valves and bleed again for a short while. Shut this valve and bleed until the air stops. Open the other valve, if you can bleed air now there is no blockage in the pipework / valves.

Open both valves (see balancing) and bleed until the first bit of water comes out, turn on the heating and test.

Is the header tank at least 2 feet above the top of this radiator?

 

[Nickthedentist]

Has it got a TRV (thermostatic valve) at one end? If so, these can jam if they're left switched off for any length of time.

Freeing them up isn't too tricky - take the plastic head off (unscrew the collar by hand, or loosen one screw), spray with WD40, then wiggle the little brass pin up and down with a pair of needle nose pliers until it pops up and stays up. Then, set the head to max and put it back on.

Good luck.