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No bits in hot water and sorry, I don't know what you mean by cwsc overflow. Hot water seems ok and when boiler is set on hot water everything is nice and quiet!

Can anyone help me with this one.....??? On start up for heating, a lot of gurgling and swishing of water heard upstairs, noisy TRV's (ticking etc) - this goes on for about a minute then it quietens down. There is definitely air in the system but it doesn't get to the rads so I can't get it...