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How to raise water pressure on J & S HE30C?

The pressure level is flashing at 0.8 . I need to raise it to approx. 1.5 - ish, I think. What do I need to do please?
Barrie Carter, November 2014
There is filling loop build in boiler right hand boiler return and main water connection open valves to fill refer to boiler manual if no manual go on line j & S www

ltd, December 2014