Boiler Fault Code LED 5 (B)

Also written as LED5B — same fault.

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

Fault code LED 5 (B) 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 is perfectly fine, it is simply pausing for a few minutes before starting up again to protect its parts. (As reported on Ferroli Hawk II)