BoilerFaultCodes SAFETY LOCKOUT High
Boiler Fault Code SAFETY LOCKOUT
Also written as SAFETYLOCKOUT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code SAFETY LOCKOUT 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 an internal safety issue and has shut itself down to prevent damage, meaning your heating and hot water will not work until it is reset or repaired. (As reported on Potterton Performa System HE)
Pick your boiler brand for the SAFETY LOCKOUT fix
Source
Information for the SAFETY LOCKOUT 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