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 1 boiler brand and 27 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 break until it needs to heat up again. (As reported on Baxi MainEco)

Pick your boiler brand for the 1 Green Flash fix

Baxi 1 Green Flash 27 models

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 27 April 2026