Boiler Fault Code LED2 on

Also written as LED2ON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code LED2 on appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has entered a safety lockout mode because it either failed to light properly or it has detected that the system is getting too hot. (As reported on Ferroli Modena F)