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The small plastic cap on the top of the auto air vent was loose. I bled all the radiators and the vent in the loft and the pressure dropped all the way to 0 bar, so I pressurized to around 1.2 bar. I did this twice and the problem seems much reduced. Was there perhaps just too much air in...

I have a newly installed Glowworm Ultracom 24cxi combination boiler. When starting it makes a reasonably loud gurgling/trickling noise that eventually stops after maybe a minute or two. The noise is perhaps best described as similar to a washing machine filling and suggests to me that...