How much does it cost to fix boiler error code Section J (Neon Flashing)?

Typical repair cost for the boiler Section J (Neon Flashing) fault is £90-180 including labour.

Section J (Neon Flashing) High

Boiler Fault Code Section J (Neon Flashing)

Also written as SECTIONJNEONFLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Section J (Neon Flashing) 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 got too hot and has automatically shut down to prevent damage. (As reported on Potterton Performa System HE)

Pick your boiler brand for the Section J (Neon Flashing) fix

Potterton Section J (Neon Flashing) 1 model

Source

Information for the Section J (Neon Flashing) 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