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 fan, which safely clears waste gases away, is not spinning correctly and has shut down the system for safety.. It appears on 2 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: Lights: Flash Flash On. Fan supply (325 Vdc), wiring, or fan component fault.
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 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 7 July 2026