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Mend Vaillant ecoTEC Combi Boiler

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
VaillantVaillant ecoTECHeating, Home Heating SystemsVaillant Combi Boiler
u need to recharge expansion vessel
need an engineer around £75

kris
September 2007

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