80 Low

Baxi 80 Fault Code

The Baxi 80 fault code means: your boiler has reached its maximum heat output capacity, meaning it is currently running at its highest intensity to meet the heating demand.. It appears on 3 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: 23.44kW (80,000 Btu/h)

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 80 fault code

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

Source

Baxi 80 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