Boiler Fault Code Neon 26

Also written as NEON26 — same fault.

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

Fault code Neon 26 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 failing to clear combustion gases properly, which means the safety system has turned the unit off to prevent a build-up of fumes. (As reported on Potterton Performa 24)