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Leakage from overflow of Vokera linea 24 combi boiler?

Pressure is being lost in boiler due to leakage from overflow pipe from boiler. Can you suggest any possible reasons or solutions?
A Tollin, January 2010
check the flexy tube to the exspansion vessel not blocked

rismith, January 2010
its passing on the prv......no air in the expansion vessel

jim, January 2010
i reckon the expansion vessel needs re inflating with a car pump up to about (1 bar pressure max ) approx 15 psi

wirecutterman, January 2010
link Click here to see other fixes for Vokera.