BoilerFaultCodes L 6 High
Boiler Fault Code L 6
Also written as L6 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code L 6 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 thinks a flame is present when there shouldn't be one, so it has locked itself for safety. (As reported on Ideal Instinct2 24)
Pick your boiler brand for the L 6 fix
Source
Information for the L 6 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