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logic30 + combi?

my logic30 combi boiler registers water pressure of 3 bar when it should read 1 to 1.5 bar. consequently I experience water air lock noise, how do I reduce the water pressure?
colin, June 2016
you release water from the bleed valve on the radiator.
https://www.youtube.com/watch?v=F3-QWp6E1KU

k, June 2016