BoilerFaultCodesBiasi Fault on gas supply Fault Code
Also written as FAULTONGASSUPPLY — same fault.
The Biasi Fault on gas supply fault code means: your boiler has stopped working because it cannot detect a steady flow of gas, which has caused it to shut down for safety.. It appears on 1 Biasi model in our database.
Technical description: A fault on gas supply resulting in a lock state
DIY fix possible
Check if other gas appliances in your home, like a hob, are working to confirm your gas supply is active.If you have a prepaid meter, ensure you have sufficient credit available.Try resetting the boiler by turning the dial to the 'R' position for a few seconds.
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Gas Safe Register →Biasi models that show the Fault on gas supply fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Biasi Fault on gas supply 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 27 April 2026