Fan Lockout High

Baxi Fan Lockout Fault Code

Also written as FANLOCKOUT — same fault.

The Baxi Fan Lockout fault code means: your boiler has detected that the internal fan is not spinning correctly, which is preventing the system from clearing out waste gases and starting up safely.. It appears on 3 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: Indicator: Upper LED Off, Middle LED Flash, Lower LED On, Bottom LED Off.
Typical repair cost £220-£450 (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 Lockout fault code

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

Source

Baxi Fan Lockout 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 27 April 2026