LED5 on High

Boiler Fault Code LED5 on

Also written as LED5ON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LED5 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 is receiving power, but it is not currently operating because it has detected an internal error that requires attention. (As reported on Ferroli Modena HE)

Pick your boiler brand for the LED5 on fix

Ferroli LED5 on 2 models

Source

Information for the LED5 on 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 27 April 2026