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Many Thanks for your advice it was the pump. The impellor must have been stuck cos a couple of knocks with the old 2lb hammer freed it and now everything is fine. I think I'll get a replacement pump though just to be ready for next time. Still a bit baffled as to how air was getting into the...

You just got me thinking cos we've not had the heating on for a few weeks. The system is charged and there was no air in it but when I try and fire up the heating it's doing the same thing? Does this still sound like the pump?

Hi Yes the Heating is charged and maintaining it's pressure?

Hi can anyone help. I can't get any hot water from my Worcester 24CDi combi. Whenever I try and draw hot water there is terrible water hammer and air gurgling. The boiler lights but goes out after a few seconds and the automatic air vent continues to release air for about 30 seconds after...