LED 3 yellow (0) [CH mode] Low

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

Also written as LED3YELLOW0CHMODE — same fault.

The Ferroli LED 3 yellow (0) [CH mode] fault code means: your boiler is currently on standby because your thermostat or timer is not sending a signal to request heating.. It appears on 2 Ferroli models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Roomstat (72) or clock (62) not calling for heat

DIY fix possible

Check your room thermostat is set to a temperature higher than the current room temperature.Ensure your programmer or digital timer is switched to the 'ON' position for the heating schedule.Replace the batteries in your room thermostat if it is a wireless unit.

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Ferroli models that show the LED 3 yellow (0) [CH mode] fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ferroli LED 3 yellow (0) [CH mode] fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

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