Cold radiators, bled them replaced one, still cold Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[dwalsh87]

Hoping someone can help. We have a detached property built around 1997, there are 9 radiators, 3 of which are not heating up. I’ve bled them all, drained the system and removed and flushed one out (upstairs bedroom) lots of black sludgy water. I reattached it and still not working so I’ve replaced it with a brand new radiator, still no joy.

It’s getting water through it (bleeds fine) but no heat at all. Anyone come across anything similar?

[stoneyboy]

Hi dwalsh87,
You have an airlock in the pipes feeding the 3 radiators. Try shutting down all working radiators and see if that will shift it.
Regards S

[ericmark]

Bleed it twice, once with lock shield off, and once with TRV off so sure both feed and return pipes free of air or blockage.

[dwalsh87]

Thanks for the replies, I’ll give them both a try at the weekend and let you know how I get on. If I’ve already full drained the system, is it still possible there is a airlock in there somewhere?