LED 3 Low

Ferroli LED 3 Fault Code

Also written as LED3 — same fault.

The Ferroli LED 3 fault code means: your boiler is currently working to heat your tap water, which is a normal operating status rather than a fault.. It appears on 1 Ferroli model 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: Domestic Hot Water circuit ON

DIY fix possible

Check if a hot water tap is currently turned on or drippingEnsure your pre-heat function is not active if the light stays on while taps are closedMonitor the boiler to see if the light goes off once the water reaches temperature

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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 7 July 2026