BoilerFaultCodes HC High
Boiler Fault Code HC
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code HC appears across 1 boiler brand and 4 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 the internal water storage tank has become too hot and has shut itself down as a safety precaution. (As reported on Worcester Bosch Highflow 550 CDi)
Pick your boiler brand for the HC fix
Source
Information for the HC 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