While you wait for answers, we may have found some information which could help you.
Success
Message
heating?
ravenheat 29t ls100t?
tap water luke warm?
ravenheat ls 80t?
RAVENHEAT RSF84T CUTING IN & OUT?
ravenheat h85t looses pressure on ch only?
ravenheat HE 85T bolier water is blowing through auto air vent any ideas?
Ravenheat HE85T - no central heating, water working fine though?
Air switch on ravenheat csi system a?
ravenheat LS80 shower water not as hot as it used to be?
I have the same problem did you get an answer?
Diverter valve?