Couldn't bleed the radiators and eventually traced it to a blockage where the expansion tank feed joins the central heating system. Not an uncommon problem apparently.
£130 later and the piece has been cut out, cleaned and put back in. I now know more than I ever desired to know about vented central heating systems.
Well, problem #1 has surfaced, 3 weeks in.
Couldn't bleed the radiators and eventually traced it to a blockage where the expansion tank feed joins the central heating system. Not an uncommon problem apparently.
£130 later and the piece has been cut out, cleaned and put back in. I now know more than I ever desired to know about vented central heating systems.