BoilerFaultCodes Ln High
Boiler Fault Code Ln
Also written as LN — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Ln appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has lost its flame while running, meaning it is not getting enough gas or the spark is failing to keep the burner lit. (As reported on Ideal Logic Code Combi ESP1)
Pick your boiler brand for the Ln fix
Source
Information for the Ln 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