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 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 detected that the exhaust gases are getting too hot or the sensor monitoring them has failed, causing the system to shut down for safety. (As reported on Biasi Riva Compact 24S)
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 27 April 2026