What the manual says
Manufacturer manualchimney sweep function at maximum output in heating mode
From this model's manual
Verified against the Biasi Inovia 2020 Combi installation & service manual.
DIY fix possible
Wait approximately 15 minutes for the test cycle to finish naturally.Try turning the mode selector dial to 'off' or 'reset' and then back to the original position.Restart the boiler by switching the power off at the fused spur and back on again.
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