D.41 Low

Boiler Fault Code D.41

Also written as D41 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code D.41 appears across 1 boiler brand and 28 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is displaying the current temperature of the water returning from your radiators rather than indicating a fault. (As reported on Vaillant ecoTEC)

Pick your boiler brand for the D.41 fix

Vaillant D.41 28 models

Source

Information for the D.41 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