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 1 boiler brand and 16 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is simply displaying the temperature setting currently programmed for your hot water, rather than indicating a system fault. (As reported on Vaillant ecoTEC plus)
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 27 April 2026