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Recently had to get a new pump for the system. But the problem is everytime the water is on for about an hour, there's a loud squealing noise. (pump set on 2 and then 1 and still does it) Someone said it was the pump (not enough water going through it?) and someone else said it was the three...

Hi all, I've got a problem with the central heating. Can anyone tell me why / what causes water to enter the header tank from the central heating. The boiler is making lots of clanking noises. Is it the trapped air causing the water into the header tank? Thanks for any answers. Jim