So, got a 9 year old gloworm 3CI boiler, worked fined since installation. Now pressure is dropping on the LCD display. So, If I pressurise to 1.2 bar, drops to <0.7 in around 12 hours. If I run the central heating at full blast, pressure goes to 2.9 bar, constant dripping from the pressure relief pipe (not the condensate one). Can anyone tell me if this is the pressure relief valve or expansion vessel? Any decent heating engineer with experience of glow worm boilers who wants to quote to come and fix it, without fleecing me is welcome to call (07970 382730), Nottingham
tom
tom