While you wait for answers, we may have found some information which could help you.
Click here for Combi Boiler Problemravenheat csi 120 no hot water?
Faulty Worscester 35 CDi loosing pressure?
ravenheat csi 85(t) 780 series red light flashing?
csi 85t ravenheat no power at fan?
pressure dropping on openning the hot water in my ravenheat csi 85 aboiler?
how can i ignite the pilot light on a ravenheat boiler?