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

Typical repair cost for the boiler E517 fault is £120-200 including labour.

E517 High

Boiler Fault Code E517

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E517 appears across 1 boiler brand and 7 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 identified an error in how its internal configuration switches are set, meaning it cannot operate safely until these are corrected. (As reported on Navien LCB700)

Pick your boiler brand for the E517 fix

Navien E517 7 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 27 April 2026