BoilerFaultCodesBaxi Burner On light off Fault Code
Also written as BURNERONLIGHTOFF — same fault.
The Baxi Burner On light off fault code means: your boiler has reached its maximum safe temperature and has shut down the burner to prevent overheating, or there is an internal electrical fault.. It appears on 2 Baxi models in our database.
Technical description: Flow reaches 80-84°C / Potentiometer failure / PCB failure
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 Burner On light off fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi Burner On light off 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