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Igotit

ive got a Ferroli domi compact F24b that i cant get the co/co2 ratio right on, the co ppm is extremely high.
It has a separate air intake supply, which rises 1 metre vertically and then 5m horizontally (running along beside the flue gas exhaust pipe) which ive checked for blockages, the working outlet pressure at the gas valve is set at what the manufacture recommends. The burner is clean and without any obstructions. the only visible item that i can see is the finns on the copper heat exchanger look slightly coroded in places.
Could this be effecting it
 

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