What the manual says
Manufacturer manualCentral Heating being supplied
From this model's manual
Verified against the Ideal Instinct2 24 installation & service manual.
DIY fix possible
No action is required as this is an operational status code, not an error.If your radiators are not getting warm despite this code, check that your room thermostat is turned up.If you wish to stop the heating, turn down your thermostat or timer.
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