I have a Ravenheat RSF Combi Boiler about 6 years old and over the last few months I have experienced pressure drops which have got worse in spite of the radiators and hot water working perfectly.At present I am losing about half a bar daily and the pressure is about 3.2 bars when fully hot.I have disconnected the filler loop to see if there are any leaks but there appear to be none.Similarly I have checked the radiators and valves and again no visible leaks.Has anybody any ideas what I can do next.
Thanks.
Thanks.