BoilerFaultCodes FLUE TEMPERATURE SENOR LOCKOUT High
Boiler Fault Code FLUE TEMPERATURE SENOR LOCKOUT
Also written as FLUETEMPERATURESENORLOCKOUT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code FLUE TEMPERATURE SENOR 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 shut itself down as a safety precaution because it detected that the exhaust gases are becoming too hot. (As reported on Johnson Starley J32 System ET)
Pick your boiler brand for the FLUE TEMPERATURE SENOR LOCKOUT fix
Source
Information for the FLUE TEMPERATURE SENOR 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