LED 3 Low

Ferroli LED 3 Fault Code

Also written as LED3 — same fault.

The Ferroli LED 3 fault code means: your boiler is working normally and is currently responding to a signal from your thermostat or timer to provide heating or hot water.. It appears on 4 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: Central heating room thermostat (72) / clock (62) calling

DIY fix possible

Check your room thermostat is set to a temperature higher than the current room temperature.Verify your heating timer or smart controller is set to 'ON' and that the display is active.Replace the batteries in your room thermostat or wireless controller if applicable.

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Ferroli models that show the LED 3 fault code

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

Source

Ferroli LED 3 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