How much does it cost to fix boiler error code E1-65?

Typical repair cost for the boiler E1-65 fault is £150-450 including labour.

E1-65 High

Boiler Fault Code E1-65

Also written as E165 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E1-65 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's internal electronic self-monitoring system has detected a technical fault and has shut down as a safety precaution. (As reported on Daikin D2CND)

Pick your boiler brand for the E1-65 fix

Daikin E1-65 1 model

Source

Information for the E1-65 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