Continually bleeding radiator

Blue76

I had TRv's fitted to all of my radiators a couple of weeks ago. Since then I have constantly had to bleed the radiator in my living room. It is luke warm at bottom and cold at the top. On bleeding this fixes the problem although seems to be only doing so temporarily. Anyone any ideas on cause/resolution?

Thanks in advance

Canucklehead

Hi

Do you know if inhibitor was added after the valves were fitted, it might not be air but hydrogen the result of system corrosion.If in doubt drain some water into a jar and add a steel nail and see if it rusts over a few days.
Other cause could be an auto air vent somewhere that is letting air into the system.Is there one in a roof space?Combis also have auto air vents.
http://www.fernox.com/?cccpage=air_in_CHS&sub=2

Corgi Guy.