LED 1 fast pulse Low

Boiler Fault Code LED 1 fast pulse

Also written as LED1FASTPULSE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LED 1 fast pulse appears across 1 boiler brand and 6 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 minor electronic sensor issue and is running at a lower power level to keep your home warm until it can be serviced. (As reported on Ideal Mini HE)

Pick your boiler brand for the LED 1 fast pulse fix

Ideal LED 1 fast pulse 6 models

Source

Information for the LED 1 fast pulse 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