A10 High

Ferroli A10 Fault Code

The Ferroli A10 fault code means: your boiler is failing to detect the flow of water through the system, which means it cannot safely start up to provide you with heating or hot water.. It appears on 2 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: Flow sensor fault
Typical repair cost £150-250 (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 A10 fault code

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

Source

Ferroli A10 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 31 August 2026