"Alan" wrote in message
m...
My 10-year old boiler (conventional, open flue) has started smelling
of gas when it fires up (and recently set my CO detector off).

Make and model please?

The flue and ventillation are all fine. I've checked the input and burner
pressures and gas rate - all spot on.

On what basis do you state that the flue and the ventilation are all fine?


The flames don't look too good - very yellow and look too big. All the
burners etc. have been properly serviced recently and this hasn't
fixed the problem.

who carried out the service and what did it cover?



regards,
Alan