BoilerFaultCodesAriston A01 Fault Code
The Ariston A01 fault code means: your boiler has failed to start because it cannot detect a flame, which is likely due to the gas supply being interrupted or a problem with the ignition system.. It appears on 8 Ariston models in our database.
Technical description: Ignition failure / Gas supply cut off
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Ariston models that show the A01 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston A01 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.
- Ariston Bravo 24 MFFI manual (PDF)
- Ariston Micro Condens manual (PDF)
- Ariston Genus 24 Rffi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026