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how can i fix my boiler?

i have a ferroli optima 901 boiler i changed the pressure vessel as my heating engineer said that was the problem. but it is still losing pressure whether on or off, i put a bottle over the outlet of the pressure relief valve and it seems to be coming from there,will i have to renew that valve.
james graham, October 2010
link Click here to see other fixes for Ferroli Optima 901.