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HELP I have put to much pressure in my Worcester Bosch 28i Junior boiler, its way above 3 pressure went not firing how do i get the pressure down B

Hi I moved in to m house 2 years ago, i have always had a problems with the rads in the house not staying constantly warm. I think i have Greenstar 28i Junior combi boiler and a very complex thing on the wall lol The thing on the wall can from what i gather can make the heating come on...