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Pressure Gauge on Biasi Garda M90F.24S not at Normal fill mark?

The pressure gauge on this boiler ( Biasi Garda M90F.24S stays at 0 but it's marked that 1 is Normal - how can I get it to rise up a bit ??
Lyn Flood, July 2009
you have a filling loop under the boilers with a tap on it

capitalboilers.co.uk, July 2009