BoilerFaultCodes Li High
Boiler Fault Code Li
Also written as LI — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Li appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected that the water inside the unit is getting too hot while it is trying to heat your tap water, so it has shut down to prevent damage. (As reported on Biasi Advance Plus)
Pick your boiler brand for the Li fix
Source
Information for the Li 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