While you wait for answers, we may have found some information which could help you.
Click here for Ravenheat Rsf 84 Etravenheat csi 120 no hot water?
Central heating but no hot water?
ravenheat csi 85 b (t) hot water no central heating?
how can i ignite the pilot light on a ravenheat boiler?
minimal hot water ?
Faulty Ravenheat condensing boiler?