BoilerFaultCodes 8A-46 High
Boiler Fault Code 8A-46
Also written as 8A46 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 8A-46 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 the water inside it is too cold and has switched itself off to prevent internal pipes from freezing and bursting. (As reported on Daikin D2CND)
Pick your boiler brand for the 8A-46 fix
Source
Information for the 8A-46 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