LED 3 yellow (0) [CH mode] Low

Boiler Fault Code LED 3 yellow (0) [CH mode]

Also written as LED3YELLOW0CHMODE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LED 3 yellow (0) [CH mode] 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 currently on standby because your thermostat or timer is not sending a signal to request heating. (As reported on Ferroli Arean)

Pick your boiler brand for the LED 3 yellow (0) [CH mode] fix

Ferroli LED 3 yellow (0) [CH mode] 2 models

Source

Information for the LED 3 yellow (0) [CH mode] 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