1 green flash Low

Boiler Fault Code 1 green flash

Also written as 1GREENFLASH — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 1 green flash appears across 3 boiler brands and 15 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has reached the correct temperature and is simply taking a natural rest; it is working exactly as it should. (As reported on Baxi EcoBlue Plus Combi)

Pick your boiler brand for the 1 green flash fix

Baxi 1 green flash 13 models Main 1 green flash 1 model Potterton 1 green flash 1 model

Source

Information for the 1 green flash 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 31 August 2026