Boiler Fault Code Neon 25

Also written as NEON25 — same fault.

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

Fault code Neon 25 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 has automatically shut down because it has detected dangerously high temperatures, effectively acting as a safety cut-out to prevent damage. (As reported on Potterton Performa 24)