Boiler Fault Code Red LED on/Flashing

Also written as REDLEDONFLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Red LED on/Flashing appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has safety-locked itself to prevent damage or because it failed to light three times in a row. (As reported on Ferroli Arean)