What the manual says
Manufacturer manualCH operation: The boiler is operating in Central Heating mode.
From this model's manual
Verified against the Daikin Ekomb 22 Combi installation & service manual, page 47.
DIY fix possible
No action is required as this is an operational status code, not a fault.Adjust your room thermostat if you wish to change the temperature.Check that your radiator valves are open if you feel the house is too cold.
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