How much does it cost to fix boiler error code D.h.w. operation?

Typical repair cost for the boiler D.h.w. operation fault is £90-180 including labour.

D.h.w. operation Medium

Boiler Fault Code D.h.w. operation

Also written as DHWOPERATION — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code D.h.w. operation appears across 1 boiler brand and 1 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 providing hot water but ignoring heating demands, or it may have a sensor glitch causing it to stay in hot water mode. (As reported on Biasi Riva Compact 24S)

Pick your boiler brand for the D.h.w. operation fix

Biasi D.h.w. operation 1 model

Source

Information for the D.h.w. operation 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