What the manual says
Manufacturer manualHeating up unit / Frost protection: The tap comfort function is keeping the heat exchanger at temperature, or frost protection has intervened because the heat exchanger temperature dropped too low.
From this model's manual
Verified against the Daikin Ekomb 22 Combi installation & service manual, page 6.
DIY fix possible
Check if the display returns to normal after 5-10 minutes.Ensure your thermostat is calling for heat if the house is cold.Verify that the boiler's condensate pipe hasn't frozen if the outside temperature is very low.
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