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

Typical repair cost for the Baxi Lights Flash Off On fault is £120-£350 including labour.

Lights Flash Off On High

Baxi Lights Flash Off On Fault Code

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

Your boiler has switched itself off because it has become too hot internally, usually due to a lack of water flow or a circulation error.

Also written as LIGHTSFLASHOFFON — same fault.

The Baxi Lights Flash Off On fault code means: your boiler has switched itself off because it has become too hot internally, usually due to a lack of water flow or a circulation error.. It appears on 3 Baxi models in our database.

Technical description: OVERHEAT LOCKOUT

Typical repair cost £120-£350 (including labour)

DIY fix possible

Check that your radiator valves are open to allow water to flow.Check the boiler pressure gauge and top it up to 1.5 bar if it is too low.Allow the boiler to cool down for 20 minutes and then press the reset button.

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Baxi models that show the Lights Flash Off On fault code

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

Source

Baxi Lights Flash 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 27 April 2026