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pressure problem Worsester combi 24/28Si?

we have qa 24/28Si boiler which should operate at 1.5 bar but it is showing just over 2 bar ??

How can i adjust this ?? i know how to add pressure if required but not how to drop pressure>

frank william taylor
November 2010
28siHeating, Home Heating SystemsPressure Combi Operate Bar

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