BoilerFaultCodes LD2, LD3 Flashing High
Boiler Fault Code LD2, LD3 Flashing
Also written as LD2LD3FLASHING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code LD2, LD3 Flashing appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected an issue with the sensor that monitors the temperature of the exhaust fumes, meaning it has switched itself off to prevent overheating. (As reported on Biasi Riva Compact HE M96a)
Pick your boiler brand for the LD2, LD3 Flashing fix
Source
Information for the LD2, LD3 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 7 July 2026