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Finally we have heat..... thanks so much. Located, purchased & fitted one expansion vessel. A bit fiddly, but with patience and an extra pair of hands from the nipper and of course following installation instructions, I now have a working boiler. Pressure has stayed put now for almost 2 hours...

Right i emptied my system as the FAQ's describes, with the system pressure at zero and one of the radiator bleed valves open the expansion vessel would not pressurize. So i tried pressurizing with the rad screw in and got it up to 9 PSI however the system pressure also increased to half a bar...

expansion vessel seems to have a fair amount of water in it turned on boiler and pressure gauge reading doubled (started at 1 bar and doubled to 2 bar) within 5 minutes, its not normally that high regards shnorbits

Checked & Expansion vessel air valve sprays water, does this mean diaphragm gone & i need a new expansion vessel. Could this also have caused the aav to fail orriginally regards Shnorbits

Boards are dried and and new valve fitted in fine, boiler now comes on fine for hot water and central heating. However the pressure in the boiler rises above the normal level worrying me to the point i shut the boiler off, could this be due to air in the system? Thank you for your reply...

I have an old worchester bosch 230 combi gas boiler 11year old. Awoke thismorning to find lots of water dripping from under boiler. There was water over the electrics, most of boiler. After mopping up, it appears the water coming from aav. Black valve found in bits, at base of boiler housing...