BoilerFaultCodes A01 High
Ariston A01 Fault Code
The Ariston A01 fault code means: your boiler has failed to light because it cannot detect a steady gas supply, so it has safely shut down to prevent gas from leaking into your home.. It appears on 13 Ariston models in our database.
Technical description: Electronic system shutdown because the supply of gas has been cut off (after third attempt to ignite the burner).
Typical repair cost £120-250 (including labour)
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 →Ariston models that show the A01 fault code
Click a model for the full fault code list and model-specific repair notes.
- Bravo 24 MFFI Repair: £120-250
- Challenger 80E Repair: £100-250
- Clas One Repair: £120-250
- E-Combi One Repair: £100-250
- E-Combi One 30 Repair: £100-250
- Egis 24 MFFI Repair: £100-£280
- Genus 24 MFFI Repair: £120-250
- Genus 27 Repair: £100-£350
- Genus 30 Plus Repair: £120-250
- Genus One 24 Repair: £120-250
- Genus One 30 Repair: £120-250
- Genus Premium Repair: £120-350
- 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.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026