A05 High

Ferroli A05 Fault Code

The Ferroli A05 fault code means: your boiler has stopped working because the internal fan, which safely removes waste gases, is not spinning at the correct speed.. It appears on 5 Ferroli models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Fan error

What causes the Ferroli A05 fault?

This fault occurs when the boiler's control board cannot detect that the fan is spinning at the required speed to safely clear exhaust gases. The most common reason is a mechanical failure within the fan motor or a communication issue caused by a damaged wiring harness or a fault on the main circuit board.

Typical repair cost £280-450 (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 A05 fault code

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

Source

Ferroli A05 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 7 July 2026