BoilerFaultCodes F8/L8 High
Boiler Fault Code F8/L8
Also written as F8L8 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F8/L8 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 has detected a software or configuration error in its internal computer, which has caused it to shut down for safety reasons. (As reported on Ideal Atlantic Combi)
Pick your boiler brand for the F8/L8 fix
Source
Information for the F8/L8 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