What the manual says
Manufacturer manualSetting 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)
From this model's manual
Verified against the Remeha Quinta 30 installation & service manual.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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