BoilerFaultCodes D neon flashing High
Boiler Fault Code D neon flashing
Also written as DNEONFLASHING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D 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 become too hot and has shut down as a safety precaution to prevent damage. (As reported on Baxi Combi 130e)
Pick your boiler brand for the D neon flashing fix
Source
Information for the D 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