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how to raise pressure bar on valiant boiler central heating down?

the pesssurwe is on 0 and the heating is not working how to raise the bar from0 to 1.5
valiant combi boiler
manuel, April 2008
locate and slowly open the filling loop (braided flexi hose with black handle) until pressure is achieved

T, April 2008
link Click here to see other fixes for Vaillant combi boiler.