AP073 Low

Baxi AP073 Fault Code

The Baxi AP073 fault code means: your boiler is noting the outdoor temperature to decide whether to turn your heating on, which is a normal status update rather than a system fault.. 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: Average external temperature [°C] when switching from summer/winter mode (with outside sensor)

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 AP073 fault code

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

Source

Baxi AP073 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