Boiler Fault Code d.68

Also written as D68 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026

Fault code d.68 appears across 3 boiler brands and 39 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 to light on its first try, which means it is having to work harder and attempt to fire up multiple times to keep your heating and hot water running. (As reported on Vaillant ecoFIT Pure 830)