Boiler Fault Code Power ON LED (Green) blinking

Also written as POWERONLEDGREENBLINKING — same fault.

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

Fault code Power ON LED (Green) blinking 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 detected that there is either not enough water inside the heating system or the sensor responsible for detecting flow is not operating correctly. (As reported on Halstead Ace High)