LED 3 OFF (DHW Mode) High

Boiler Fault Code LED 3 OFF (DHW Mode)

Also written as LED3OFFDHWMODE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LED 3 OFF (DHW Mode) 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 has lost the ability to measure the temperature of the water used for your taps and shower, so it cannot produce hot water. (As reported on Ferroli Falcon)

Pick your boiler brand for the LED 3 OFF (DHW Mode) fix

Ferroli LED 3 OFF (DHW Mode) 1 model

Source

Information for the LED 3 OFF (DHW Mode) 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