How much does it cost to fix boiler error code D.077?

Typical repair cost for the boiler D.077 fault is £100-200 including labour.

D.077 Low

Boiler Fault Code D.077

Also written as D077 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code D.077 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 currently set to use a restricted amount of power when heating your hot water, which may cause your taps or shower to take longer to heat up than usual. (As reported on Vaillant ecoTEC Pro)

Pick your boiler brand for the D.077 fix

Vaillant D.077 7 models

Source

Information for the D.077 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