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i have a vc gb 242 eh vaillant 41 044 07 ?

everytime i put the water on the flame starts to lift from the burners and i can smell gas outside from the flue pipe, i had a new fan fitted prior to this problem occuring, could it be something to do with that~???
HACKEDOFF, June 2011
Indeed it could be to do with the fan. Fitted poorly, not correctly sealed between inner and outer flue will cause exactly those problems.

Carefree, June 2011
link Click here to see other fixes for Vaillant.