Boiler Fault Code Overheat Neon

Also written as OVERHEATNEON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Overheat Neon 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 itself off because it reached a dangerously high temperature to prevent damage or safety hazards. (As reported on Baxi Solo PF)