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Ariston Euro Combi boiler loses pressure. ?

Hi, my Arriston Euro Combi Boiler loses pressure to 0 bar and does not operate. I fill the system up to around 1.5 bar and it drops down to 0 bar within a few hours. What could be causing this?
abs, July 2009
Your heating system has a leak somewhere, but check the outside overflow first - thats the easy bit!

John, July 2009
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