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Switched between DHW and CH a few times, messed about with Expansion vessel pressure, blasted water through system by opening filling loop and expelling from drain cock and most importantly opened air vent with boiler running, quite a bit of air was expelled. Job done, Boiler humming away...

Really appreciate the advice, shall try suggestions tomorrow. Should I say later today.

Air came out of the AAV for about 5 secs, I believe the pump is working as it is vibrating when I place my hand on it and it's quite warm

Wow, super quick replies. Thank you very much guys. Whats the best way to bleed air from combi boiler ? I've tried the vent above pump, would it be worth my while loosening the screw on the pump ?

Hi, The expansion vessel in my Potterton performa 28i has failed, water coming out of schraeder valve. Reading the very helpful advice on this forum I decided to fit an external expansion vessel teed off CH return with 15mm pipe into 3/4 female. The vessel is located beside the boiler so bottom...