FAN High

Baxi FAN Fault Code

The Baxi FAN fault code means: your boiler has detected an issue with the internal ventilation system that prevents it from starting safely, meaning you currently have no heating or hot water.. It appears on 5 Baxi 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: Faulty fan or wiring; continuity check from K to L and M to N, and O to P, Q to T, S to R.
Typical repair cost £180-350 (including labour)

Engineer required

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

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Baxi models that show the FAN fault code

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

Source

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

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026