Flue gas sensor faulty High

Ferroli Flue gas sensor faulty Fault Code

Also written as FLUEGASSENSORFAULTY — same fault.

The Ferroli Flue gas sensor faulty fault code means: your boiler has stopped working because it can no longer accurately read the temperature of the exhaust chimney, meaning it has shut down as a safety precaution.. It appears on 1 Ferroli model 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: Sensor damaged or wiring cut
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 Flue gas sensor faulty fault code

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

Source

Ferroli Flue gas sensor faulty 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