How much does it cost to fix boiler error code E517?

Typical repair cost for the boiler E517 fault is £120-250 including labour.

E517 High

Boiler Fault Code E517

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code E517 appears across 1 boiler brand and 6 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 is confused because its physical configuration switches have been moved or incorrectly set, preventing it from starting safely. (As reported on Navien NCM 1130HH)

Pick your boiler brand for the E517 fix

Navien E517 6 models

Source

Information for the E517 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