How much does it cost to fix Ariston error code E23?

Typical repair cost for the Ariston E23 fault is £150-300 including labour.

E23 High

Ariston E23 Fault Code

Q: What does the Ariston E23 fault code mean?

Your boiler has detected that the internal exhaust fan is not spinning fast enough to remove combustion gases safely, so it has shut down to prevent a hazard.

The Ariston E23 fault code means: your boiler has detected that the internal exhaust fan is not spinning fast enough to remove combustion gases safely, so it has shut down to prevent a hazard.. It appears on 5 Ariston models in our database.

Technical description: Low fan speed

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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Ariston models that show the E23 fault code

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

Bravo 24 MFFI Repair: £150-300
Egis 24 MFFI Repair: £180-350
Genus 24 MFFI Repair: £120-220
Genus 27 Repair: £90-180
Genus Premium Repair: £120-220

Source

Ariston E23 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