What the manual says
Manufacturer manualVentilating: When the unit is started, the fan is first brought up to its correct start rpm. Also visible when there is post-fanning.
From this model's manual
Verified against the Daikin Ekomb 22 Combi installation & service manual, page 6.
DIY fix possible
Wait for 2-3 minutes to see if the code clears automaticallyEnsure there are no external blockages to the flue pipe outside your homeRestart the boiler once via the power button if the code stays on for over 10 minutes
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