SF Low

Baxi SF Fault Code

The Baxi SF fault code means: your boiler is currently running a brief self-diagnostic calibration test, which is a normal process after recent adjustments or a power cycle.. It appears on 1 Baxi model 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: Calibration Mode active (alternating with current boiler temperature)

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 SF fault code

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

Source

Baxi SF 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