flue is fine, air intake is fine, hoses no slits or holes, replaced air pressure switch and venturi but the the micro switch still isnt making contact when the fan is running? tested coil on fan got overload/infinity fan fault then???
have a problem with an older baxi model! when calling for heat boiler ignites and comes on fine, lasts for about a minute then cuts out before pipes can even get warm! also pump could be under-floor which is sealed off so no way to check it!??