LC High

Boiler Fault Code LC

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LC appears across 3 boiler brands and 22 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has tried to start five times in a row but failed to keep the flame alight, causing it to shut down as a safety precaution. (As reported on Ideal i Combi 2)

Pick your boiler brand for the LC fix

Ideal LC 20 models Keston LC 1 model Zanussi LC 1 model

Source

Information for the LC 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