While you wait for answers, we may have found some information which could help you.
Click here for M Getting Hotcsi 85t ravenheat no power at fan?
pressure dropping on openning the hot water in my ravenheat csi 85 aboiler?
Faulty Worscester 35 CDi loosing pressure?
Faulty Ravenheat condensing boiler?
minimal hot water ?
What is wrong with my ravenheat white star combination boiler,?