BoilerFaultCodes 8C High
Boiler Fault Code 8C
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 8C 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 that it is getting too hot too often and has locked itself down as a safety precaution to prevent damage. (As reported on Worcester Bosch Greenstar 12i System)
Pick your boiler brand for the 8C fix
Source
Information for the 8C 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