How much does it cost to fix Baxi error code Lights: Flash, Flash, On?

Typical repair cost for the Baxi Lights: Flash, Flash, On fault is £180-350 including labour.

Lights: Flash, Flash, On High

Baxi Lights: Flash, Flash, On Fault Code

Q: What does the Baxi Lights: Flash, Flash, On fault code mean?

Your boiler has detected an issue with its internal fan or the air flow required for safe operation, causing it to shut down for safety.

Also written as LIGHTSFLASHFLASHON — same fault.

The Baxi Lights: Flash, Flash, On fault code means: your boiler has detected an issue with its internal fan or the air flow required for safe operation, causing it to shut down for safety.. It appears on 3 Baxi models in our database.

Technical description: Go to Fan Lockout section of the fault finding instructions.

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 Lights: Flash, Flash, On fault code

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

Source

Baxi Lights: Flash, Flash, On 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