High CO2 levels

The flue seals seem fine. I checked the sir intake and it read 0. I also lossened the case to put my probe inside for 15 minutes and it read 0. It's not leaking anything. The problem must be within the heat exchanger.

I gave it a kiss and cuddle too but still no joy.
 
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Are you sure the FGA is good? In calibration?

As they can give odd readings when they need calibration.
 
Yeah mate it's just been calibrated and I retested it in my own boiler after.

I've been accepted on CC now so I'll post on there from now on.
 

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