How much does it cost to fix boiler error code E1-73?

Typical repair cost for the boiler E1-73 fault is £350-£600 including labour.

E1-73 High

Boiler Fault Code E1-73

Also written as E173 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E1-73 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 computer has encountered a software glitch or a technical hiccup and needs a system restart to try and clear the error. (As reported on Daikin D2CND)

Pick your boiler brand for the E1-73 fix

Daikin E1-73 1 model

Source

Information for the E1-73 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