C/h problem

[qwerty123]

HI all got a bit of a problem. I have a house with 12 rads in. I installed a new bigger rad in the main living room. Since this I have a problem I get a rad that does not get hot but its not always the same 1? last time it was in the small living room now its in the bathroom? Other times it will work fine and all rads will get hot (from top to bottom).

All rads have been bleed.
All balanced.
No sludge ( system was cleaned, when drained down water was clear)

Any ideas

Many thanks

Whitty

 

[Winston]

If the rads are fully bled try turning all the rads off bar the cold one, if it then heats up open the other rads to see if that makes any difference. Also if you have a ch pump make sure it is on position three and that the valves either end of the pump are fully open.