While you wait for answers, we may have found some information which could help you.
Click here for Pressure Worcester Heatminimal hot water ?
What is wrong with my ravenheat white star combination boiler,?
ravenheat csi 85(t) 780 series red light flashing?
Central heating but no hot water?
how can i ignite the pilot light on a ravenheat boiler?
pressure dropping on openning the hot water in my ravenheat csi 85 aboiler?