Boiler Fault Code Neon 2

Also written as NEON2 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code Neon 2 appears across 3 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has automatically shut down because it has detected that it is getting too hot inside, likely because the water is not circulating as it should. (As reported on Glow-worm Space Saver Compleheat 30 40 50)