cold radiators at the bottom

[Aleksandar]

Radiator in my lounge is cold at the bottom and hot at the top. I have fashed the system and replaced old (double) with a new double radiator and put new valve as well, in fact all my radiators(single) apart from that one are working perfectly fine upstairs and dowstairs. I have bleed the radiators too but nothing happen. I have pipes of 15mm running throughout the house.
Can you please advise what could be the possible reasons for this radiator not to heat properly.

 

[glasgowgas]

needs balanced?

see faqs

 

[twgas]

I have bleed the radiators too but nothing happen

If this is true then you have either left both valves turned off or both pipes are blocked (or 1 off and 1 blocked)

 

[crockett]

Maybe,just maybe, the rad you bought could have had debris left in it from manufacture, one of the fins may have a blockage. I had this problem with a fancy column radiator. Exchanged it, the new one was fine. Just a thought

 

[bengasman]

How did you flush the system?