Cold Radiator after Draining Down?

DazJarvis

I recently drained down my gravity fed central heating system to fit new radiator and valves in bedroom, however when I filled the system back up, switched boiler on and bled radiators my loung radiator and its in and out pipes are still cold? I\\\'ve tried closing all other radiators (both ends) off and leaving only problem Radiators open but still cold and in pipe only gets bit warmer? Is it blocked (Air or Sludge?) Thanks Daz

hi-spec plumbing heating · Posted: Thu Nov 22, 2007 1:36 pm Post Subject:

if shutting all other rads didn't move it.
try shutting both rad valves and disconnecting from rad then open the cold one over a bowl.
letting the water flow can sometimes shift the airlock in the pipe, then refit

DazJarvis · Posted: Thu Nov 22, 2007 1:55 pm Post Subject:

Cheers mate, I'll try that this weekend! The Lockshield end on the problem radiator has a drain tap, can I use that to unblock radiator, just I have a very very light cream carpet! Doh!

hi-spec plumbing heating · Posted: Thu Nov 22, 2007 2:10 pm Post Subject:

shut the other end and let that pipe flow if thats the cold pipe and airlock should shift.

DazJarvis · Posted: Thu Nov 22, 2007 2:40 pm Post Subject:

Cheers mate, so I need to close valve on end where pipe is warmish and fit hose to drain valve on other end and let water air out?