Boiler Fault Code d0

Also written as D0 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code d0 appears across 1 boiler brand and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is displaying a code that does not correspond to a recognised error, which often indicates a temporary software glitch or a communication issue between the system components. (As reported on Alpha E-Tec NXS)