BoilerFaultCodes Green light flashing slowly High
Boiler Fault Code Green light flashing slowly
Also written as GREENLIGHTFLASHINGSLOWLY — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Green light flashing slowly 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 is currently waiting for a signal from your heating controls, meaning it does not know that you want the heating or hot water turned on. (As reported on Potterton Profile 60E)
Pick your boiler brand for the Green light flashing slowly fix
Source
Information for the Green light flashing slowly 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