BoilerFaultCodes neon flashing (Section B) High
Boiler Fault Code neon flashing (Section B)
Also written as NEONFLASHINGSECTIONB — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code neon flashing (Section B) 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 struggling because the internal pump, which pushes water around your radiator system, is stuck or has stopped working correctly. (As reported on Potterton Performa System HE)
Pick your boiler brand for the neon flashing (Section B) fix
Source
Information for the neon flashing (Section B) 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