Boiler Fault Code L 0-

Also written as L0 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code L 0- 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 locked itself out because it has been manually reset too many times in a short period while trying to clear an underlying fault. (As reported on Ideal Logic Max Combi 2)