Unable to bleed radiators

[Boutya]

After draining the CH system and fixing the faulty radiator, I am ubale to fill CH backup again. When I try to bleed any of the radiators no air comes out.

Can someone help ?

 

[Nige F]

1-look for a small "header" tank in loft with water in and ballvalve filling it

 

[Boutya]

Header tank is full

 

[Nige F]

OK...if there`s a motorised valve or 2 try moving the lever that sicks out the side, and hooks.this holds valve(s) open...vent the pump and check it`s spinning...threads on this subject look for small air bleeds on "stalks" in airing cupd. open + see.

 

[ArtfulBodger]

Did you check that the header tank had emptied when you drained the system?

 

[ollski]

blocked cold feed, try tapping the tee where the feed from the tank joins the system pipework, failing that push a hose up the vent pipe as far around the corner as possible and then hold the other end tight over where the ball vale fills, then backfill the system from the ball valve. You should then be able to bled the rads a bit, then do it again, and again etc.

 

[Boutya]

Eventually was able to bleed all the radiators. However, when I switched heating on,upstairs radiators only got hot,down stairs still cold

Pump seems to be working ok