BoilerFaultCodes Safety system failure High
Boiler Fault Code Safety system failure
Also written as SAFETYSYSTEMFAILURE — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Safety system failure appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal computer has encountered a critical error during its automatic safety checks and cannot safely operate, requiring a professional to investigate. (As reported on Halstead Finest 80)
Pick your boiler brand for the Safety system failure fix
Source
Information for the Safety system failure 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