LED 3 Low

Boiler Fault Code LED 3

Also written as LED3 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LED 3 appears across 3 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is working normally and is currently responding to a signal from your thermostat or timer to provide heating or hot water. (As reported on Ferroli Arean)

Pick your boiler brand for the LED 3 fix

Ferroli LED 3 4 models Ideal LED 3 1 model Myson LED 3 6 models

Source

Information for the LED 3 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