BoilerFaultCodes d.58 Low
Boiler Fault Code d.58
Also written as D58 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code d.58 appears across 2 boiler brands and 22 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 communicating with an optional solar water heating system to check if it can help warm your water, which is a normal operational status rather than a fault. (As reported on Vaillant ecoFIT Pure 830)
Pick your boiler brand for the d.58 fix
Source
Information for the d.58 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