How much does it cost to fix Baxi error code Lockout?

Typical repair cost for the Baxi Lockout fault is £0-120 including labour.

Lockout High

Baxi Lockout Fault Code

Q: What does the Baxi Lockout fault code mean?

Your boiler has stopped working because it has detected a temperature that is too high and has temporarily disabled itself for safety.

Also written as LOCKOUT — same fault.

The Baxi Lockout fault code means: your boiler has stopped working because it has detected a temperature that is too high and has temporarily disabled itself for safety.. It appears on 3 Baxi models in our database.

Technical description: Red light indicator - Can occur if the boiler has overheated; reset by turning control knob OFF, wait 10 seconds, then turn ON

Typical repair cost £0-120 (including labour)

DIY fix possible

Turn the boiler control knob to the 'OFF' position.Wait for at least 10 seconds to allow the system to reset.Turn the control knob back to your desired setting.

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Baxi models that show the Lockout fault code

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

Source

Baxi Lockout 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