how can i fix my baxi 105e combi?

I have exactly the same problem, engineer has been out, serviced boiler, cleaned out venturi in flue and checked all piping for blockages. Fan is still running perfect as before and pressure is still on a good 1 bar. But, still keep getting fault on fan or flue. Seems strange but it seems to be mostly when outside temperatures are very cold, e.g in the night. Does anybody have any ideas?

Nacol
January 2011

if the fan is running the air pressure switch has proved so it is probably a blocked venturi in the flue.

deano
October 2010

may be the air pressure switch

b
October 2010