LED 1: On, LED 2: Off High

Boiler Fault Code LED 1: On, LED 2: Off

Also written as LED1ONLED2OFF — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LED 1: On, LED 2: Off 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 failed to light the flame and has turned itself off for safety. (As reported on Halstead Buckingham 4)

Pick your boiler brand for the LED 1: On, LED 2: Off fix

Halstead LED 1: On, LED 2: Off 1 model

Source

Information for the LED 1: On, LED 2: Off 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