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Thanks Picasso, it was the air separator. Working well now (touch wood)

Hi, thanks again. That is what I thought too, but I cant shift it. Tried draining down, forcing mains through etc. I can hear a little coming out of the automatic air vent occasionally but no change. its like air is constantly getting in Thanks

Hi, thanks for your reply. The bypass seems to join the return from the hot water cylinder. It is always very hot. If i shut it off the situation does not improve. the pump looks correct. It is on the feed, arrow pointing down towards the motorised valves. The zone valves are working...

Hello, I need some help please I have an open vented central heating system with a Potterton Profile Boiler. Probably 25 years old I was having trouble getting all of the radiators hot at the same time, by turning the upstairs off I could get most of the downstairs hot for a while and vice...