What does the Navien E517-0 fault code mean?

Your boiler has detected an internal configuration error with its control board settings, meaning it cannot operate safely until corrected.

How much does it cost to fix Navien error code E517-0?

Typical repair cost for the Navien E517-0 fault is £90-180 including labour.

Manufacturer manual

Dip switch setting error

From this model's manual

Verified against the Navien/Navien Ncb Ce installation & service manual.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like E517-0: no call-out fees, no surprise bills.

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Seeing a different code? Every code this model can display, in one place.

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Break-even maths on monthly cover.

What a UK service costs and what a proper one includes.