B LED 3 High

Ferroli B LED 3 Fault Code

Also written as BLED3 — same fault.

The Ferroli B LED 3 fault code means: your boiler is currently idle because it is not receiving a signal from your thermostat or timer to start heating.. It appears on 2 Ferroli models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Roomstat (72) or clock (62) not calling for heat
Typical repair cost £80-150 (including labour)

DIY fix possible

Check your room thermostat and ensure the temperature set point is higher than the current room temperature.Verify that your external timer or programmer is set to 'On' and that the current time is set correctly.Replace the batteries in your wireless thermostat if applicable to ensure it is communicating with the receiver.

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Ferroli models that show the B LED 3 fault code

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

Source

Ferroli B 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