BoilerFaultCodes L.097 High
Boiler Fault Code L.097
Also written as L097 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code L.097 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to mix the right amount of air with the gas it uses to create a flame, which means it has safely shut itself down to prevent inefficient burning. (As reported on Vaillant ecoTEC plus)
Pick your boiler brand for the L.097 fix
Source
Information for the L.097 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