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Thanks everybody who replied - all sorted now - I think the trick was getting the motorised valve into the right position (i.e. calling for heating) the airlocks seemed to clear when I briefly turned the CH control to ON postion and suddenly air was hissing out of all the rads. Cheers.

Yes, it's gravity and the water is coming into the F?E tank just fine - the propblem seems to be distributing the water from the F?E tank to the radiators...

Now I'm trying to refill the system, there are 22 radiators and I am trying to fill them one by one starting with the lowest (as the book says), but each time I open a bleed valve a little air comes out of that radiator and then it stops filling - if I go to another radiator the same thing...

When I open the drain plug (supposedly the lowest point in the system) only a little drip of brown water is coming out, but when I undo the actual radiator valve that I'm trying to replace, loads clean water gushes out! The header tank is empty and stop-cock closed, so no fresh water can be...

I drained down my CH system overnight to replace a leaking radiator valve. I thought i could leave the hot water system running, but I noticed the pump making a strange noise this morning and I guess i've messed up! I've turned the boiler and pump off now, but my question is am i likely to have...