This video was taken during the boiler service. It it necessary to do combustion analysis test and gas rate after servicing and check the Co ratio , Co2 percentage and the Co as per manufactures instructions. In this video it shows co ration is 0 .0005, and the Co2 ratio is 8.7%. Co ratio of 0.004 or below is accaptable for this combi boiler. Also Co2 ratio of 9.2% +1 or -1 is satisfactory for this boiler ( please refer to the manufactures instruction for Vaillant Ecotec+ range).
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