How much does it cost to fix boiler error code LED1 on?

Typical repair cost for the boiler LED1 on fault is £120-240 including labour.

LED1 on High

Boiler Fault Code LED1 on

Also written as LED1ON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code LED1 on appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected a failure with the safety system that handles smoke and fumes, preventing it from firing up for your safety. (As reported on Ferroli Combi 77 FF Popular)

Pick your boiler brand for the LED1 on fix

Ferroli LED1 on 3 models

Source

Information for the LED1 on fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026