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Thanks for the quick reply
I'm pretty sure there's oil getting through as I can see it in a clear tube getting pulled through, not sure what a Tigerloop is ?
I wonder if anyone can help ?
I had a Grandee Oil Combi boiler installed in the autumn last year, it was commisssioned and seemed ok until it started to get cold, (less than 2-3 degrees celsius outside).
The CO2 setting at commissioning was 12% and CO 20ppm, and Flue gas temp 85 degrees...