What the manual says
Manufacturer manualmaximum output in heating mode (Chimney sweep function)
From this model's manual
Verified against the Biasi Rinnova Adaptive Combi System installation & service manual.
DIY fix possible
Wait for the 15-minute test timer to expire automaticallyPress the Reset or Mode button to manually exit the test modeTurn the heating or hot water dials slightly to see if the display reverts to the temperature
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