BoilerFaultCodes Green 'Running' light Low
Boiler Fault Code Green 'Running' light
Also written as GREENRUNNINGLIGHT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Green 'Running' light appears across 1 boiler brand and 1 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 currently heating up water for your taps or your radiators. (As reported on Glow-worm Swift Flow 100)
Pick your boiler brand for the Green 'Running' light fix
Source
Information for the Green 'Running' light 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