How much does it cost to fix boiler error code D.016?

Typical repair cost for the boiler D.016 fault is £150-300 including labour.

D.016 High

Boiler Fault Code D.016

Also written as D016 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code D.016 appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is signalling a communication issue between its internal electronic control board and the heating system, meaning it cannot currently start the heating cycle. (As reported on Vaillant ecoTEC Pro 24)

Pick your boiler brand for the D.016 fix

Vaillant D.016 7 models

Source

Information for the D.016 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