How much does it cost to fix Ferroli error code A15?

Typical repair cost for the Ferroli A15 fault is £120-280 including labour.

A15 High

Ferroli A15 Fault Code

Q: What does the Ferroli A15 fault code mean?

Your boiler has shut down because it has repeatedly detected an issue with how it clears exhaust fumes, likely due to a persistent air flow problem.

The Ferroli A15 fault code means: your boiler has shut down because it has repeatedly detected an issue with how it clears exhaust fumes, likely due to a persistent air flow problem.. It appears on 3 Ferroli models in our database.

Technical description: Fault F05 generated 5 times within the last 24 hours – possible error with the air pressure switch

Typical repair cost £120-280 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ferroli models that show the A15 fault code

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

Source

Ferroli A15 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026