BoilerFaultCodes Over temperature High
Boiler Fault Code Over temperature
Also written as OVERTEMPERATURE — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Over temperature 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 reached an unsafe temperature and has automatically shut down to prevent damage and ensure your safety. (As reported on Worcester Bosch Greenstar 25Si)
Pick your boiler brand for the Over temperature fix
Source
Information for the Over temperature 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