What the manual says
Manufacturer manualAnti freezing system, pump and burner on
From this model's manual
Verified against the Chaffoteaux Calydra 23 Green installation & service manual, page 17.
DIY fix possible
Ensure the boiler remains connected to the power supplyCheck that the gas supply is turned onIncrease the room thermostat temperature slightly to help warm the systemCheck that any external pipes are properly insulated
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