BoilerFaultCodes d.06 Low
Boiler Fault Code d.06
Also written as D06 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code d.06 appears across 2 boiler brands and 17 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is currently reading the temperature setting for your hot water, which is simply a status message indicating the system is processing your requested temperature rather than reporting a fault. (As reported on Vaillant ecoFIT Pure 425)
Pick your boiler brand for the d.06 fix
Source
Information for the d.06 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