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how can i i raise low water pressure on ferroli boiler he26?

i have a ferroli he 26 boiler. f37 displayed on screen how do i rectify .do i adjust blue valves or black.
chaloner, October 2014
under boiler open two valves both black one with liver other round nob or simple go on line type your boiler on page 5 its given detail how to fill or refer to manual ,liver type make it straight and round anti clock to open

ltd, October 2014
link Click here to see other fixes for Ferroli.