BoilerFaultCodes d.08 Low
Boiler Fault Code d.08
Also written as D08 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code d.08 appears across 1 boiler brand and 22 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning This code is simply an information display showing the current signal from your wall thermostat, letting you know if your heating is correctly receiving a request to turn on or off. (As reported on Vaillant ecoTEC plus System)
Pick your boiler brand for the d.08 fix
Source
Information for the d.08 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