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

Typical repair cost for the boiler Lockout light on fault is £90-250 including labour.

Lockout light on High

Boiler Fault Code Lockout light on

Also written as LOCKOUTLIGHTON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lockout light on appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped itself for safety because it failed to light or stay running, and it needs to be manually reset. (As reported on Ideal Concord Super Series 4)

Pick your boiler brand for the Lockout light on fix

Baxi Lockout light on 2 models Ideal Lockout light on 1 model

Source

Information for the Lockout light on fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026