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Biasi Combi Boiler leaking water from automatic air purger valve?

Hi,
Our combi boiler is spraying water out from the automatic air purger valve.
Does anyone know if this is something we can fix ourselves and how ? or is it a call to an engineer.

Many Thanks !
Jan, April 2007
our combi boiler is leaking from what i think is the condensation pipe. it only happens during severe cold and when the heating is on.

dawn, December 2010
SHUT OFF THE FEED & RETURN PIPES UNDER THE BOILER & DRAIN VIA THE SAFETY VALVE. (SPRING LOADED KNOB WITH RED TOP) UNSCREW THE AUTO AIR VENT & SCREW IN A NEW ONE. OPEN FEED & RETURN PIPES & REFILL & PRESSURISE TO APPROX 1 BAR. ITS THAT SIMPLE.

DAVE12, April 2007