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Navien · Tankless water heater

E517 DIP switch setting abnormal

Medium severity Navien NPE-2

What the control is telling you

The DIP switch settings are not valid for this unit.

Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2

Likely causes

  • Front panel DIP switch changed
  • PCB model DIP switches changed

Test and repair steps

  1. Warning: turn off power before touching DIP switches.
  2. Front panel 2-switch block switch 1 = gas type (OFF natural gas, ON propane), switch 2 = temperature lock.
  3. The PCB DIP switches set the model at the factory and must not be changed - return them to factory position if moved.
  4. Reset once with the Back button on the front panel and note whether the code returns.
  5. Fix given phone Navien Technical Support, 1-800-519-8794.

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Source: Navien NPE-A2/S2 User's Information Manual (20049624A), 5.2 Understanding Error Codes, p.17. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.