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Ferrolli boiler pressure loss?

losing water pressure on a ferrolli combi boiler and water coming out of the over flow pipe
HBD, July 2011
your expansion vessel needs re-pressurised.

Ian, July 2011
draim out water from systerm open all rad air vent
change preasure valve shut all air vent refil water in systerm to 1.5 bar

lal, July 2011
link Click here to see other fixes for Ferrolli Combi.