Radiator mystery

[douglas9401]

I've just had my brother in law on the phone telling me that he has one radiator on the middle floor of their townhouse that's stone cold while every other one in the house is hot.
Here's the mystery bit, he bleeds the rad and hot water comes out with no air or interruption in the flow but the radiator itself remains cold.
Any ideas?
Ta.

[The Builder]

....... should be able to make money out of a trick like that Douglas ;o)

Seriously though, folks....... I guess the rad could be out of balance with the others. Try opening up the lockshield valve a turn or so (valve at opposite end to the TRV(Thermo Rad Valve)

[douglas9401]

I knew you'd be first in TB. :)
Thanks very much, I'll phone him back with your suggestion.

[douglas9401]

Success! A brisk tap on the valve, a further bleed and all is toasty in Thurso.
My thanks again to The Builder for giving that suggestion in a previous answer for me to pass on.
He can help while having his tea. :)

[The Builder]

Aha ............... so, pin stuck down? A good tap. I should have suggested that first :o(

[AlBags]

That will be five pounds .. to the pair of us please ..
(I am his background advisor .. when he's got his feet up, I'm usually up a ladder)
Al.

[hollygolly]

Just found this post, not sure if the gasman is out or not! But have tried your suggestion and still have a cold section on the bottom of my rad. Had a ladrge kitchen extension a few months ago, added 3 new radiators two small ones, and one huge one 1.2m long and about 400mm high. All the radiators in teh house are so hot you cannot touch them, the large one is warm on the top and luke warm on the bottom, have tried bleeding, draining, and of course your suggestion, stilll the same? Any ideas what to do next? This rad is the main rad for the extension, 11,500btus