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how can i fix my ravenheat ls100t boiler?

i have a ravenheat ls100t aautomatic modulating boiler and the pressue keeps going up to 4 bars i keep draining it off but it keeps going back up is it the air pressure switch thats faulty or can i re-pressurrize back up with a pump if so how?
tony, May 2009
Your Expansion Vessel needs topping up with compressed air, or if will not accept air charge the Vessel will need repalcing

www.elanar.co.uk, May 2009
link Click here to see other fixes for Ravenheat LS100T.