How much does it cost to fix boiler error code Lockout light (constant)?

Typical repair cost for the boiler Lockout light (constant) fault is £120-250 including labour.

Lockout light (constant) High

Boiler Fault Code Lockout light (constant)

Also written as LOCKOUTLIGHTCONSTANT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lockout light (constant) appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage, while the pump keeps running to try and cool it back down. (As reported on Worcester Bosch Greenstar 15sbi)

Pick your boiler brand for the Lockout light (constant) fix

Worcester Bosch Lockout light (constant) 2 models

Source

Information for the Lockout light (constant) 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