What the manual says
Manufacturer manualAnti freezing system, pump and burner on
From this model's manual
Verified against the Chaffoteaux/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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Related fault codes
All 22 fault codes on the Calydra 24 Green
Seeing a different code? Every code this model can display, in one place.