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what is a venturi on baxi boiler 105e which could be blocked?

what is a venturi on baxi boiler 105e which could be blocked?
chop, December 2010
thanks for all replys .
flue sealing collar broken could this cause boiler to overheat

chop, December 2010
probably in the flue just above the fan a rubber tube is connected to it if it is blocked the fan pressure switch won't work

brian, December 2010
link Click here to see other fixes for Baxi 105E.