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Vaillant eco tec 624 s 41 error?

My Vaillant eco tec combi boiler water pressure gauge is constantly in the red when central heating is on. The higher the heating is turned up it goes off the bar scale. How can I rectify this?

matt
January 2014
VaillantHeating, Home Heating SystemsError Water Pressure
You will probably need to re-pressure/replace the internal expansion vessel

Carefree
January 2014
drain out to reduce to 1.2bar,from drain point or from rad air vent ,make sure that filling loop is close

ltd
January 2014

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