How much does it cost to fix boiler error code FLUE TEMPERATURE SENOR LOCKOUT?

Typical repair cost for the boiler FLUE TEMPERATURE SENOR LOCKOUT fault is £120-250 including labour.

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 7 July 2026

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 detected an issue with the sensor that monitors the safety of the exhaust gases and has turned itself off to stay safe. (As reported on Johnson Starley Quantec C)

Pick your boiler brand for the FLUE TEMPERATURE SENOR LOCKOUT fix

Johnson Starley FLUE TEMPERATURE SENOR LOCKOUT 1 model

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 7 July 2026