I spoke to Baxi's technical department who suggested it may be something to do with the plugs on the PCB and asked me to check them. On the second plug from the bottom, there are two links, the colours and number of which depend on the boiler output. The links are actually resistors which alter the fan speed settings according to the boiler output. The links on the 18kW model are yellow and grey. They also suggested it was caused by the difference in gas pressure over the pipework or that the flue may not have been incorrectly assembled. All valid suggestions but not in this case. We tried another PCB, but that made no difference.
The solution was to replace the gas valve with a new one. This gave us CO of 40ppm, and CO2 of 8.5% which is within the manufacturers tolerance of 9% +/-1%. Not what you want when fitting a brand new boiler on a Friday.
Disclaimer:
The works
described in this blog are a record of work undertaken and should
not be taken as guaranteed to solve your problem.
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