0C High

Boiler Fault Code 0C

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 0C appears across 2 boiler brands and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has shut down because the electrical power coming into it is too weak or unstable to run safely. (As reported on Viessmann Vitodens 200)

Pick your boiler brand for the 0C fix

Viessmann 0C 7 models Vokera 0C 1 model

Source

Information for the 0C 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