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Navien · Boiler

E517 DIP switch setting fault

Medium severity Navien NHB-HNavien NFB-H

What the control is telling you

DIP switch setting is invalid. Manual action: check DIP switch settings.

Applies to: Navien NHB-H (NHB-055H/080H/110H/150H) and NFB-H fire-tube (NFB-175H/200H) condensing boilers

Likely causes

  • SW1 model switches (5 and 6) do not match the boiler model
  • Invalid SW1/SW2 combination after service or PCB replacement

Test and repair steps

  1. Warning: Turn off power before changing DIP switches.
  2. Check SW1 #5/#6 model setting (NHB: 055H OFF/OFF, 080H ON/OFF, 110H OFF/ON, 150H ON/ON; NFB: 200H OFF/OFF, 175H ON/OFF).
  3. Check SW1 #1/#2 are OFF/OFF for normal operation.
  4. Check SW2 gas type, altitude and other switches against the Specs tables.
  5. Restore power and confirm the code clears.

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Source: Navien NHB-H Installation and Operation Manual, 11.14 Understanding Error Codes, p.119; Navien NFB-H Installation Manual, 11.7 Understanding Error Codes, p.116; NHB-H User's Information Manual (V1.0 Apr 2024), 5.2, p.24. Summarized in our own words; check the original manual for your model.

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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.