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how can i fix my ferroli spa boiler?

my ferrolli combi boiler will not keep central heating pressure and every time i fill it via the fill tap it drains out of the overflow pipe at the rear of my property is there a problem with the pressure release valve?
gareth, December 2009
Hi, h/w is working but c/h wont come on. Pressure is ok. I'v tried reset but it keeps going on standby mode.

Zak, January 2013
prv only warn u. i think yr expension vessel need to be repressurised.

paul h k, December 2009
link Click here to see other fixes for Ferroli DOMINA 90.