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Thanks for that, I guessed it would b but sometimes u find things in life that are not logical! The airlock has been cured, by manually refiling system down the pump inut pipe (with pump removed) the whole system now is pretty air free, i'll keep bleeding all the rads over the next few days just...

Yes, after priming the system manually I refitted the header and released the ball cock, all that part of the system seems fine, I think it was the air lock from hell that was preventing the fall of the header water to refill the system. Just a daft question, the gate valves on the ends of the...

Ok after a frought day we seem to have made some progress! In the end I couldn't get any water from the header to the rest of the system, I cut the pipe feeding the system in the airing cupboard and syphoned out the header. I found a drain screw in the boiler and remocved that, a small amount...

The header is plastic and all the pipes are copper so I guess rust marks would b unlikey. Im planning on the pump removal, if only to check for blockages further up the system,tomorrow morning. I hope I haven't missed some really obvious bleed/drain valve somewhere but i am bug**ed if I can find...

The water in the small header tank is clean. My next idea was to remove the pump and see if water started to flow from header as a result (into a bucket with ball cock disabled again). I based this idea on the fact there was a pipe leading from small header to pipe which feeds both pump (lower)...

HI, I might b going over old ground here, sorry if I am! I am fitting a towel rad in bathroom. needed to drain system as it needed alterations to pipework. I have a vented pumped system y layout. I disabled float valve in loft, opened bleed valves, and opened up drain valves in ground floor...