How much does it cost to fix Navien error code 5.2.15 Error 517?

Typical repair cost for the Navien 5.2.15 Error 517 fault is £150-300 including labour.

5.2.15 Error 517 High

Navien 5.2.15 Error 517 Fault Code

Q: What does the Navien 5.2.15 Error 517 fault code mean?

Your boiler’s internal computer is struggling to identify its own configuration settings, which prevents it from starting up correctly.

Also written as 5215ERROR517 — same fault.

The Navien 5.2.15 Error 517 fault code means: your boiler’s internal computer is struggling to identify its own configuration settings, which prevents it from starting up correctly.. It appears on 6 Navien models in our database.

Technical description: Are the DIP S/W on the PCB properly set?

Typical repair cost £150-300 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Navien models that show the 5.2.15 Error 517 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Navien 5.2.15 Error 517 fault code information on this page is sourced and cross-checked against the official Navien service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026