Fan On Low

Baxi Fan On Fault Code

Also written as FANON — same fault.

The Baxi Fan On fault code means: your boiler is operating normally, and this indicator light simply shows that the internal fan is running as expected to vent the system.. It appears on 2 Baxi models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Indicator light - Check if fan and pressure switch plug is connected and if there is mains at the fan connection

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 On fault code

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

Source

Baxi Fan 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 7 July 2026