How much does it cost to fix boiler error code RED LOCKOUT BUTTON?

Typical repair cost for the boiler RED LOCKOUT BUTTON fault is £100-350 including labour.

RED LOCKOUT BUTTON High

Boiler Fault Code RED LOCKOUT BUTTON

Also written as REDLOCKOUTBUTTON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code RED LOCKOUT BUTTON appears across 1 boiler brand and 1 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 a safety or performance problem and has shut itself down to prevent damage. (As reported on Keston R-sm 20 FB)

Pick your boiler brand for the RED LOCKOUT BUTTON fix

Keston RED LOCKOUT BUTTON 1 model

Source

Information for the RED LOCKOUT BUTTON 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