BoilerFaultCodes D.064 Medium
Boiler Fault Code D.064
Also written as D064 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D.064 appears across 1 boiler brand and 7 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 ignite smoothly, which means it is taking longer than expected to light the burner when you turn on your heating or hot water. (As reported on Vaillant ecoTEC Pro 30)
Pick your boiler brand for the D.064 fix
Source
Information for the D.064 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