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How can i fix my Vaillant combi boiler?

The water pressure drops quite fast when the central heating is turned on. Looking at the external overflow pipe i can see the water dribbling out. How do I fix it and will it be expensive?

Adam, September 2007

home Fix label Heating label_important Home Heating Systems category Vaillantdone

u need to recharge expansion vessel
need an engineer around £75

kris, September 2007

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home Fix label Heating label_important Home Heating Systems category Vaillant

How can i fix my Vaillant combi boiler?

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How can i fix my Vaillant combi boiler?

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How can i fix my Vaillant combi boiler?

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