How much does it cost to fix boiler error code Safety Lockout (Red LED)?

Typical repair cost for the boiler Safety Lockout (Red LED) fault is £120-250 including labour.

Safety Lockout (Red LED) High

Boiler Fault Code Safety Lockout (Red LED)

Also written as SAFETYLOCKOUTREDLED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Safety Lockout (Red LED) 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 stopped working because it failed to start, which could be due to a simple supply issue or a more complex internal fault. (As reported on Halstead Ace)

Pick your boiler brand for the Safety Lockout (Red LED) fix

Halstead Safety Lockout (Red LED) 2 models

Source

Information for the Safety Lockout (Red LED) 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