Re: Boiler too much pressure !
release some pressure from a radiator bleed valve.
as for the prv should activate at 3 bar, but i have come across ones that have jammed.
as for pressure rising when heating on maybe be your expansion vessel needs charging or split. it will useally fall again when heating off.
check your filling loop is fully closed and not passing water.
drain some from your rads till it is about 1.5 bar then switch heating on see if it gos up then turn heating off see if it falls again.
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