How much does it cost to fix Baxi error code Lights Off Off Off?

Typical repair cost for the Baxi Lights Off Off Off fault is £80-180 including labour.

Lights Off Off Off High

Baxi Lights Off Off Off Fault Code

Q: What does the Baxi Lights Off Off Off fault code mean?

Your boiler is not receiving the signal to turn on, which usually means your external heating controls like the thermostat or programmer are not calling for heat.

Also written as LIGHTSOFFOFFOFF — same fault.

The Baxi Lights Off Off Off fault code means: your boiler is not receiving the signal to turn on, which usually means your external heating controls like the thermostat or programmer are not calling for heat.. It appears on 2 Baxi models in our database.

Technical description: No Switched Live to boiler. Check Systems Controls and System Wiring.

Typical repair cost £80-180 (including labour)

DIY fix possible

Check that your room thermostat is turned up higher than the current room temperature.Ensure your heating programmer or timer is set to 'ON' or 'AUTO'.Check if the fuse for the heating system spur (usually a switch near the boiler) has blown or is turned off.

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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 27 April 2026