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replaced air swicth but still E33/E34 code ?

Help; i have replaced the swicth but still it ( ariston boiler is not working
terry, August 2009
the fan runs when the water is turned on, but i get E33/E34 codes; Can you explian more about the fan being a problem? i see threads that say clean the blades?

terry, August 2009
may also be the fan or venturi, or possibly even the pcb.

Ian, August 2009
link Click here to see other fixes for Ariston.