BoilerFaultCodes Neon L1 Low
Boiler Fault Code Neon L1
Also written as NEONL1 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Neon L1 appears across 2 boiler brands and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is connected to the electricity supply and is waiting for a request to provide heating or hot water, so everything is working exactly as it should. (As reported on Halstead Hero)
Pick your boiler brand for the Neon L1 fix
Source
Information for the Neon L1 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