How much does it cost to fix boiler error code High Limit Thermostat (Yellow)?

Typical repair cost for the boiler High Limit Thermostat (Yellow) fault is £90-180 including labour.

High Limit Thermostat (Yellow) High

Boiler Fault Code High Limit Thermostat (Yellow)

Also written as HIGHLIMITTHERMOSTATYELLOW — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code High Limit Thermostat (Yellow) 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 automatically shut down because the water inside has become far too hot, acting as a safety precaution to prevent damage. (As reported on Firebird Enviro Combi 26)

Pick your boiler brand for the High Limit Thermostat (Yellow) fix

Firebird High Limit Thermostat (Yellow) 1 model

Source

Information for the High Limit Thermostat (Yellow) 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