How much does it cost to fix boiler error code D.050?

Typical repair cost for the boiler D.050 fault is £150-300 including labour.

D.050 High

Boiler Fault Code D.050

Also written as D050 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code D.050 appears across 1 boiler brand and 4 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 maintain the correct fan speed required to burn fuel efficiently, which has caused it to pause operation for safety reasons. (As reported on Vaillant ecoTEC Pro 28)

Pick your boiler brand for the D.050 fix

Vaillant D.050 4 models

Source

Information for the D.050 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