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print out results o2% 6.9 co2 10.4 co ppm 28 eff g 85.86 NET C 153.2 FLUE C 158.7 INLET C 5.5 CO/CO2 0.000 X AIR % 49.60 CO PPMN 36 O2 REF % 3.0 PRS MBAR 0.06

Could fuel line still be a prob if aga going ok. Single line from 2500 litre plastic double bunded tank . we have checked filter at tank and is ok, Single line about 30 metres long gravity fed and line splits 1 metre before gets to boiler, 1 line to aga and 1 to boiler. Height of tank about 1.5...

Standard rain top cowl no bird mesh, not revolving , not H piece. We have had cowl off and flue appears clear. Has been working ok for 8 years since boiler fitted. The engineer also mentioned possibility of crack in casing holding nozzle?

Definately kerosene Engineer did mention bad fuel but said this was ok as came from reputable large compant "Johnstone oil". Also prob did not appear to start until 4 weeks after delivery of fuel. He did check combustion etc after he cleaned out boiler. (probe into small hole attached to meter)...

Please help. After 4 visits from boiler engineer we are still stuck. We have an 8 year old Boulter boiler with a horizontal air intake from outside and a vertical flue. The boiler is serviced every year and this year one month after an oil tank fill and the service we had belching black smoke...