Your boiler is displaying a status code indicating how it has been configured to manage your heating and hot water settings, but it is not currently indicating a system failure.

Technical description

Setting for appliance control (1 X: central heating modulating; 2 X: central heating high/low ext.input; X 0: central heating off, D.H.W.off; X 1: central heating on, D.H.W.on; X 2: central heating on, D.H.W.off; X 3: central heating off, D.H.W.on)