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I HAVE A BAXI COMBI 105 INSTANT BOILER WHICH IS JUST OVER A YEAR OLD NOW.
WHEN ITS ON ITS PRE HEAT STORE MODE THE BOILER SOUNDS LIKE IT IS FULL OF AIR, ITS FINE WHEN THE HEATING IS ON AND ALSO WHEN USING HOT WATER THE PRESSURE IS 1.5 BAR AND I HAVE VENTED THE BOILER MANY TIMES.
WHEN ITS ON ITS PRE HEAT STORE MODE THE BOILER SOUNDS LIKE IT IS FULL OF AIR, ITS FINE WHEN THE HEATING IS ON AND ALSO WHEN USING HOT WATER THE PRESSURE IS 1.5 BAR AND I HAVE VENTED THE BOILER MANY TIMES.