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My boiler won't light but will when we take the cover off ?

Chaffoteaux and maury won't light but will when we take the cover off but as soon as we put it back on it goes off again
Claire, December 2015
Fan Venturi most likely. Not a diy job though get a gas engineer in

Claire's hero, January 2016
link Click here to see other fixes for Chaffoteaux.