Cold rad

[coldroy]

Had a radiator with cold centre for a while, now all cold but will bleed and no air comes out so i took rad off drained down system it was full of crap after refitting refilled system went round bled rads but this rad still cold any clue to what ive done wrong thanks its got a header tank in loft

roy

 

[Slugbabydotcom]

The pipes to it are probably still full of crud.
Take the rad off again and see if you can flush some water from both valves.
Stick a hose pipe on and back flush if one is slow or doesn't let any water out at all.
Invest in a magnaclean and some inhibitor to stop it happening again and consider a powerflush or at least a chemical flush to help the magnaclean along.

 

[coldroy]

Had water coming out of both pipes when rad was off

roy

 

[Slugbabydotcom]

Ok so you flushed some water from both ends so the only bit left is the rad itself. Have you had a hosepipe on the rad and flushed it through?
If so the way is clear for it to circulate so whats left to check out?
Is the pump working ok?
Have you tried balancing the system?
There could be a partial blockage !
Seeing as you mention a cold spot it could be that the cold part of the radiator is rusted solid or otherwise blocked internally and the only cure for that is a new rad.

Make sure the heating is turned off when you bleed the rad as you could drag air into the system.

 

[coldroy]

Yes flushed rad it was full of crap now running clear. Balanced rads? no how please also was going to turn off as many rads as poss (some fittings very tight) dont fancy forcing them and see if that does anything ta

roy

 

[Slugbabydotcom]

Balacing rads is number 2 here
I get the feeling that there is more crud that needs to come out so it might be worth repeating the exercise.
Turning all rads off may help but you could end up moving the blockage from one place to another.

 

[coldroy]

Thanks back on shift till next week cheers

roy

 

[coldroy]

Just a quick update found loads more crap in rad turned off all rads left one on all working now thanks everyone for your help

coldroy (think il have to change my name now)

 

[John506]

lol, warmroy