not clear information, is presure zero when cold and high when heating hot than is pressure vessel,or if high all times than either filling loop not closed properly, best way checking is open silver flex pipe and see if driping, if not than leave out and reduce pressure from rad air key and check again, if still rising than may be plate heatexchanger may be leaking within, check by stop cold water to boiler and than see and will be able to figure it out where is problem
k
April 2012
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