While you wait for answers, we may have found some information which could help you.
Click here for Boiler Wont Ignitecsi 85t ravenheat no power at fan?
ravenheat csi 85(t) 780 series red light flashing?
What is wrong with my ravenheat white star combination boiler,?
Central heating but no hot water?
Faulty Worscester 35 CDi loosing pressure?
pressure dropping on openning the hot water in my ravenheat csi 85 aboiler?