How much does it cost to fix Ariston error code A14?

Typical repair cost for the Ariston A14 fault is £150-£300 including labour.

A14 High

Ariston A14 Fault Code

Q: What does the Ariston A14 fault code mean?

Your boiler has detected that it is running too hot and has automatically switched itself off to prevent any damage or safety issues.

The Ariston A14 fault code means: your boiler has detected that it is running too hot and has automatically switched itself off to prevent any damage or safety issues.. It appears on 1 Ariston model in our database.

Technical description: Overheat Thermostat

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 A14 fault code

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

Clas One Repair: £150-£300

Source

Ariston A14 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