BoilerFaultCodesBaxi Lights: On Off On Fault Code
Also written as LIGHTSONOFFON — same fault.
The Baxi Lights: On Off On fault code means: your boiler has tried to light several times but failed, so it has locked itself out for safety.. It appears on 2 Baxi models in our database.
Technical description: Ignition Lockout
DIY fix possible
Check that your gas supply is turned on at the meterCheck if other gas appliances (like a hob) are workingPress the reset button or turn the control knob to '0' for ten seconds then back to 'On'
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Baxi models that show the Lights: On Off On fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi Lights: On Off 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