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Sorry for not replying to Velvet and Ogoshi, I been away. Velvet - The pressure gauge on the boiler is not indicating atmospheric (ambient) pressure. It's reading pressure above ambient. The gauge is calibrated to read zero at ambient. Liken it to letting all the air pressure out of a car...

Thanks Ogoshi, but that's strange, cos the fixed red needle on the gauge is at 0.5 bar and the installation book says it should be charged to 0.5 bar. Hmmm... (scratching of head)

Hi all, I have different problem with my system. When the central heating is off and cold, and I make a domestic hot water demand (shower, tap or washing machine), the water starts to heat up, then the boiler makes an awful clunking sound and the pilot goes out. Some sort of safety cut out...