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

Typical repair cost for the Baxi Lockout light on fault is £90-180 including labour.

Lockout light on High

Baxi Lockout light on Fault Code

Q: What does the Baxi Lockout light on fault code mean?

Your boiler has likely stopped working because it reached a temperature that is too high, causing it to shut down for safety.

Also written as LOCKOUTLIGHTON — same fault.

The Baxi Lockout light on fault code means: your boiler has likely stopped working because it reached a temperature that is too high, causing it to shut down for safety.. It appears on 2 Baxi models in our database.

Technical description: This can occur if the boiler has overheated. Reset by turning control knob OFF, wait 10 seconds then turn ON. Check continuity across the overheat thermostat.

Typical repair cost £90-180 (including labour)

DIY fix possible

Turn the control knob to the OFF positionWait for at least 10 secondsTurn the control knob back to the ON position and check if the boiler fires up

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Baxi models that show the Lockout light on fault code

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

Source

Baxi Lockout light 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