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how to bring my boiler upfrom 3.5 to 2?

my pressure has gone up to 3.5and is in the red how can i bring the pressure down??? please help

kim
December 2010
Heating, Home Heating SystemsBoiler Red Help
bleeding the rads will bring the pressure down in the system but needs doing when cold

A1
December 2010

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Boiler Pressure Too High? (3.5 to 2 Bar)