BoilerFaultCodes C10 High
Boiler Fault Code C10
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code C10 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 is confused because two temperature sensors have been incorrectly identified or swapped, preventing it from safely heating your water. (As reported on Atag Premier)
Pick your boiler brand for the C10 fix
Source
Information for the C10 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