How much does it cost to fix boiler error code neon flashing (5th instance)?

Typical repair cost for the boiler neon flashing (5th instance) fault is £120-250 including labour.

neon flashing (5th instance) Medium

Boiler Fault Code neon flashing (5th instance)

Also written as NEONFLASHING5THINSTANCE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code neon flashing (5th 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's control switch is currently stuck in the reset position, preventing it from starting up normally. (As reported on Potterton Performa 28i)

Pick your boiler brand for the neon flashing (5th instance) fix

Potterton neon flashing (5th instance) 1 model

Source

Information for the neon flashing (5th 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