How much does it cost to fix boiler error code d15?

Typical repair cost for the boiler d15 fault is £150-300 including labour.

d15 High

Boiler Fault Code d15

Also written as D15 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code d15 appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is having trouble managing the speed of its internal fan, which is preventing it from safely lighting and heating your home. (As reported on Alpha Evoke)

Pick your boiler brand for the d15 fix

Alpha d15 5 models

Source

Information for the d15 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