LED4 (Permanent) Low

Ferroli LED4 (Permanent) Fault Code

Also written as LED4PERMANENT — same fault.

The Ferroli LED4 (Permanent) fault code means: your boiler is correctly operating in heating mode, and the light indicates that your central heating system is currently active.. It appears on 6 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 circuit on

DIY fix possible

Check your room thermostat or boiler timer settingsTurn down the temperature dial on your thermostat to see if the light turns offIf you want the heating off, ensure your wall controller is set to off or standby

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Ferroli models that show the LED4 (Permanent) fault code

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

Source

Ferroli LED4 (Permanent) 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