flue venturi fault [blocked]
could just replace [or clean] the venturi
personally id the replace the fan as well, just to be on safe side
if the venturi has gotten to the stage of being blocked
chances are the fan performance has deteriorated as well
well known fault on vokera boilers
manwithnoname
May 2011
I can answer this question...
how can i fix my vokera synergy gas boiler which is registering code 03 flu?
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