Green light On only Low

Boiler Fault Code Green light On only

Also written as GREENLIGHTONONLY — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Green light On only appears across 1 boiler brand and 8 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 exactly as it should and is currently burning gas to heat your home's water or radiators. (As reported on Potterton Suprima HE)

Pick your boiler brand for the Green light On only fix

Potterton Green light On only 8 models

Source

Information for the Green light On only 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