L6 High

Boiler Fault Code L6

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code L6 appears across 3 boiler brands and 27 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler thinks it sees a flame even though it isn't currently trying to light, causing the system to shut down for safety. (As reported on Keston S30)

Pick your boiler brand for the L6 fix

Baxi L6 1 model Ideal L6 18 models Keston L6 8 models

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 27 April 2026