Green LED: On | Red LED: Off Low

Boiler Fault Code Green LED: On | Red LED: Off

Also written as GREENLEDONREDLEDOFF — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Green LED: On | Red LED: Off appears across 2 boiler brands and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is working normally and is simply indicating that a hot water tap is currently turned on somewhere in your home. (As reported on Vokera Aquanova)

Pick your boiler brand for the Green LED: On | Red LED: Off fix

Potterton Green LED: On | Red LED: Off 2 models Vokera Green LED: On | Red LED: Off 2 models

Source

Information for the Green LED: On | Red LED: 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