How much does it cost to fix boiler error code D.47?

Typical repair cost for the boiler D.47 fault is £100-200 including labour.

D.47 Low

Boiler Fault Code D.47

Also written as D47 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code D.47 appears across 2 boiler brands and 30 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to read the temperature from the sensor installed outside your home, so it is temporarily using a default setting to ensure your heating still works. (As reported on Vaillant ecoTEC plus VU GB 656/4-5 A)

Pick your boiler brand for the D.47 fix

Glow-worm D.47 11 models Vaillant D.47 19 models

Source

Information for the D.47 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 31 August 2026