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 11 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.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like A01: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Ariston models that show the A01 fault code
Click a model for the full fault code list and model-specific repair notes.
- ACO 27 MFFI
- ACO 32 MFFI
- Bravo 24 MFFI Repair: £120-250
- Ecosystem 27 RFFI Repair: £120-250
- Euro Combi 30 MFFI Repair: £120-250
- Genus Repair: £120-250
- Genus 24 MFFI Repair: £120-250
- Genus 24 Rffi Repair: £120-250
- Genus 27 Repair: £100-£350
- Micro Condens Repair: £120-250
- Microsystem 15 Repair: £100-250
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 ACO 32 MFFI manual (PDF)
- Ariston Genus 24 Rffi manual (PDF)
- Ariston Micro Condens manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026