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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