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

Typical repair cost for the boiler Section M (Neon Flashing) fault is £120-250 including labour.

Section M (Neon Flashing) High

Boiler Fault Code Section M (Neon Flashing)

Also written as SECTIONMNEONFLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Section M (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 switched itself off because it has detected that the exhaust gases have become too hot, which is a safety protection measure. (As reported on Potterton Performa System HE)

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

Potterton Section M (Neon Flashing) 1 model

Source

Information for the Section M (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