L6 High

Boiler Fault Code L6

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code L6 appears across 4 boiler brands and 17 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler thinks a flame is present even though it hasn't been safely ignited, causing the system to shut down for safety. (As reported on Ideal Logic Combi C24 C30 C35)

Pick your boiler brand for the L6 fix

Baxi L6 1 model Ideal L6 12 models Keston L6 3 models Zanussi L6 1 model

Source

Information for the L6 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 7 July 2026