How much does it cost to fix Ariston error code A02?

Typical repair cost for the Ariston A02 fault is £150-300 including labour.

A02 High

Ariston A02 Fault Code

Q: What does the Ariston A02 fault code mean?

Your boiler has detected that the internal fan, which is essential for pushing out combustion fumes, is not working correctly, causing the boiler to shut down for safety.

The Ariston A02 fault code means: your boiler has detected that the internal fan, which is essential for pushing out combustion fumes, is not working correctly, causing the boiler to shut down for safety.. It appears on 10 Ariston models in our database.

Technical description: Fan

Typical repair cost £150-300 (including labour)

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 A02 fault code

Click a model for the full fault code list and model-specific repair notes.

Challenger 80E Repair: £150-300
Clas One Repair: £150-300
E-Combi One Repair: £150-300
E-Combi One 30 Repair: £150-300
Euro Combi 30 MFFI Repair: £180-350
Euro Prisma 24 Repair: £180-350
Genus 24 MFFI Repair: £120-250
Genus 27 Repair: £0-120
Genus Premium Repair: £0-120
Microsystem 15 Repair: £150-300

Source

Ariston A02 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