K Unknown

Boiler Fault Code K

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code K appears across 4 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Pick your boiler brand for the K fix

Baxi K 1 model Main K 1 model Potterton K 1 model Worcester Bosch K 2 models

Source

Information for the K 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 31 August 2026