neon flashing (4th instance) High

Boiler Fault Code neon flashing (4th instance)

Also written as NEONFLASHING4THINSTANCE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code neon flashing (4th instance) 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 trying to start the fire needed to heat your water but is failing to detect a flame after several attempts. (As reported on Potterton Performa 28i)

Pick your boiler brand for the neon flashing (4th instance) fix

Potterton neon flashing (4th instance) 1 model

Source

Information for the neon flashing (4th instance) 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