How much does it cost to fix Ariston error code A13?

Typical repair cost for the Ariston A13 fault is £120-£250 including labour.

A13 High

Ariston A13 Fault Code

Q: What does the Ariston A13 fault code mean?

Your boiler has detected an issue with how it manages the air needed for safe combustion, causing it to shut down to prevent unsafe operation.

The Ariston A13 fault code means: your boiler has detected an issue with how it manages the air needed for safe combustion, causing it to shut down to prevent unsafe operation.. It appears on 3 Ariston models in our database.

Technical description: Air Pressure Switch

Typical repair cost £120-£250 (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 A13 fault code

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

Clas One Repair: £120-£250
Genus 24 MFFI Repair: £90-180
Micro Combi 27 MFFI Repair: £120-200

Source

Ariston A13 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