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this is useful if you discover the readings are very very high.Reset the circuit board then turn off the boiler for 10 seconds turn it back on with the shortcut .Then recalibrate the gas valve if the readings are still high and call the manufacturer. 137 ppm 9.3 co2 is pretty normal

factory reset.This would reset some faults like temperature problems , no hot water no symbol for the tap , temperature problems, f40 , A61 always check the condense isnt blocked first

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