LED 1 Slow Flashing (2Hz) High

Boiler Fault Code LED 1 Slow Flashing (2Hz)

Also written as LED1SLOWFLASHING2HZ — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LED 1 Slow Flashing (2Hz) appears across 2 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has entered a safety lockout mode because it failed to light or stay on properly after multiple attempts. (As reported on Glow-worm Micron 30ff)

Pick your boiler brand for the LED 1 Slow Flashing (2Hz) fix

Glow-worm LED 1 Slow Flashing (2Hz) 4 models Halstead LED 1 Slow Flashing (2Hz) 1 model

Source

Information for the LED 1 Slow Flashing (2Hz) 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