LED 4 (Flashing) Low

Boiler Fault Code LED 4 (Flashing)

Also written as LED4FLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LED 4 (Flashing) appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is currently in standby mode for the central heating and is waiting for a signal from your thermostat to turn on. (As reported on Ferroli Modena F)

Pick your boiler brand for the LED 4 (Flashing) fix

Ferroli LED 4 (Flashing) 1 model

Source

Information for the LED 4 (Flashing) 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 7 July 2026