How much does it cost to fix Ariston error code I / Fume Sensor?

Typical repair cost for the Ariston I / Fume Sensor fault is £120-250 including labour.

I / Fume Sensor Emergency

Ariston I / Fume Sensor Fault Code

Q: What does the Ariston I / Fume Sensor fault code mean?

Your boiler has detected an issue with the system that ensures dangerous exhaust fumes are safely removed from your home, so it has shut itself down as a safety precaution.

Also written as IFUMESENSOR — same fault.

The Ariston I / Fume Sensor fault code means: your boiler has detected an issue with the system that ensures dangerous exhaust fumes are safely removed from your home, so it has shut itself down as a safety precaution.. It appears on 1 Ariston model in our database.

Technical description: Fume Sensor L.E.D.

Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ariston models that show the I / Fume Sensor fault code

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

Egis 24 MFFI Repair: £120-250

Source

Ariston I / Fume Sensor fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026