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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

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