LED1 on High

Ferroli LED1 on Fault Code

Also written as LED1ON — same fault.

The Ferroli LED1 on fault code means: your boiler has detected a failure with the safety system that handles smoke and fumes, preventing it from firing up for your safety.. It appears on 1 Ferroli model 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: N/C contact of air pressure switch should be closed between 67-66 of P.C.B.
Typical repair cost £120-240 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ferroli models that show the LED1 on fault code

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

Source

Ferroli LED1 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