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Hi You have answered many of your own queries, it is not 'sucking air' as you have not re-pressurised system. i have had this siuation many times on my systems, but i usually get over it. My own conclusion would be:- 1. Cavitation, i know it's a sealed system and the pump will have been...

Hi Andy The reason it is coming on ad hoc is due to it being set on comfort mode this ensures that you have hot water immediately you turn the tap on, basically it pre-heats the hot water before you draw it, this can also be disabled by pressing the R button once, then press the return button...

Hi Andy The number 6 you are refering to is the pump overun mode the boiler is in at that particular time, it should be overunning at factory setting 2mins, but this could have been overidden by installer to run to 99!!!! Only by getting into the installer settings will you find out...