BoilerFaultCodesBiasi LD1 Fault Code
The Biasi LD1 fault code means: your boiler has lost its flame or failed to light, usually due to a lack of gas or a detection fault, meaning you have no heating or hot water.. It appears on 1 Biasi model in our database.
Technical description: Operation light 1 (as seen in wiring and voltage diagrams)
DIY fix possible
Check if your gas prepay meter has credit available.Verify that other gas appliances, like a hob, are working correctly.Press the Reset button on the control panel to see if the boiler restarts.
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Biasi models that show the LD1 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Biasi LD1 fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026