How much does it cost to fix boiler error code d11?

Typical repair cost for the boiler d11 fault is £200-400 including labour.

d11 High

Boiler Fault Code d11

Also written as D11 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code d11 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's electronic control system is showing an undefined status, which typically means the internal computer is failing to communicate correctly. (As reported on Alpha E-Tec Plus 10 / 18)

Pick your boiler brand for the d11 fix

Alpha d11 2 models

Source

Information for the d11 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