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Why is my water pressure increasing..pass 3bar?

my boiler has just been seriviced 4hrs ago since than the water pressure has rison from 1bar to 3 and its rising ive not even turend the hot water on. wheres this pressure coming from...help???
KS, October 2007
It sounds like the filling loop has been opened !!

gas-man, October 2007
check the filling loop is shut.

hi-spec plumbing & heating, October 2007