PS
The CHeating does seem to go off eventually left to it's own devices even if DHW is not called for, especially if the CH is on 'low'.
Cheers, The Prisoner
The Boiler will fire up ok & stay on for a half an hour or an hour or so but it eventually switches off on it's own. It seems that calling for Hot Water causes the Burner & Burner LED to go off; Hot water comes out at first but then quickly goes cold (within a minute or 2). Turning the Hot water...