F46 High

Ferroli F46 Fault Code

The Ferroli F46 fault code means: your boiler has detected an issue with the sensor that monitors the temperature and safety of the exhaust gases leaving your system, so it has shut down to keep you safe.. It appears on 4 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: Flue sensor fault
Typical repair cost £120-220 (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 F46 fault code

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

Source

Ferroli F46 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