While you wait for answers, we may have found some information which could help you.
Click here for Boiler Worked Daysminimal hot water ?
ravenheat csi 85 b (t) hot water no central heating?
csi 85t ravenheat no power at fan?
Faulty Worscester 35 CDi loosing pressure?
Central heating but no hot water?
ravenheat csi 120 no hot water?