BoilerFaultCodesBaxi Lights: Off Off Off Fault Code
Also written as LIGHTSOFFOFFOFF — same fault.
The Baxi Lights: Off Off Off fault code means: your boiler appears to have no power reaching it at all, meaning the control lights are off and it cannot start up to provide heating or hot water.. It appears on 3 Baxi models in our database.
Technical description: Electrical Supply fault - No Switched Live to boiler or PCB fuse failure.
DIY fix possible
Check that the main boiler power switch (usually a red fused spur near the boiler) is turned into the ON position.Ensure your room thermostat or programmer is turned up and calling for heat.Check your home's main consumer unit (fuse box) to see if a circuit breaker has tripped.
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Baxi models that show the Lights: Off Off Off fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi Lights: Off Off 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