Green LED on Low

Ferroli Green LED on Fault Code

Also written as GREENLEDON — same fault.

The Ferroli Green LED on fault code means: your boiler is receiving power and is ready to work, but it hasn't been told to turn on the heating or hot water yet.. 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: Boiler is on but there is no heat demand
Typical repair cost £0-120 (including labour)

DIY fix possible

Check that your room thermostat is turned up higher than the current room temperature.Ensure your programmer or heating timer is set to 'ON'.Turn on a hot water tap to see if the boiler fires up for water demand.

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Ferroli models that show the Green LED on fault code

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

Source

Ferroli Green LED on 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 7 July 2026