How much does it cost to fix Ferroli error code F9?

Typical repair cost for the Ferroli F9 fault is £150-300 including labour.

F9 High

Ferroli F9 Fault Code

Q: What does the Ferroli F9 fault code mean?

Your boiler has lost its connection to the component that controls the gas supply, meaning it cannot start up to provide heat or hot water.

The Ferroli F9 fault code means: your boiler has lost its connection to the component that controls the gas supply, meaning it cannot start up to provide heat or hot water.. It appears on 5 Ferroli models in our database.

Technical description: No communication between the electronic unit and the gas valve. Possible causes: Incorrect wiring; Damaged valve.

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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Ferroli models that show the F9 fault code

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

Source

Ferroli F9 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