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Navien NFB-175H - User Manual

Navien NFB-175H
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WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result,
causing property damage, personal injury, or death.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this
or any other appliance.
WHAT TO DO IF YOU SMELL GAS
●
Do not try to light any appliance.
●
Do not touch any electrical switch; do not use any phone in your building.
●
Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s
instructions.
●
If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or
the gas supplier.
The installation must conform with local codes or, in the absence of local codes, the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and
Propane Installation Code.
Keep this manual near this boiler for future
reference whenever maintenance or service
is required.
User’s Information Manual
NFB-H Condensing Boilers
Model
NFB-175H
NFB-200H

Table of Contents

Other manuals for Navien NFB-175H

Preview: Installation Manual
Installation Manual135 pages

Questions and Answers

  • C
    Christopher RossSep 15, 2025
    What does Error Code E594 mean on my Navien NFB-175H Boiler?
    • J
      Jamie JohnsonSep 15, 2025
      Error Code E594 indicates abnormal operation of the EEPROM. The suggested solution is an alarm.
  • D
    David GonzalezAug 25, 2025
    What does Error Code E001 mean on my Navien NFB-175H Boiler?
    • F
      freemanmichaelAug 25, 2025
      Error Code E001 indicates that the heat exchanger is over temperature. You can try an auto reset or a manual reset.
  • W
    William MckinneyAug 25, 2025
    What does Error Code E003 mean on my Navien NFB-175H?
    • C
      Christopher BrennanAug 26, 2025
      Error Code E003 indicates an ignition failure. Try a manual reset.
  • W
    William BryantAug 26, 2025
    What does Error Code E016 mean on my Navien Boiler?
    • S
      Stephanie JacksonAug 27, 2025
      Error Code E016 indicates overheating of heat exchanger. Try a manual reset.
  • Z
    zacharysharpSep 16, 2025
    What does Error Code E615 mean on my Navien NFB-175H?
    • K
      Kevin JensenSep 16, 2025
      Error Code E615 indicates abnormal operation of input and memory. The suggested solutions are alarm, auto reset, or manual reset.
  • A
    Anita ReyesSep 23, 2025
    What does Error Code E786 mean on my Navien Boiler?
    • C
      christopher70Sep 23, 2025
      Error Code E786 indicates an improper front panel. The suggested solution is an alarm.
  • S
    Samantha GardnerSep 8, 2025
    What does Error Code E762 mean on my Navien Boiler?
    • Z
      Zachary FritzSep 8, 2025
      Error code E762 indicates an abnormal flue gas duct due to a vent pipe not properly inserted. Try an auto reset.
  • K
    Keith GomezSep 8, 2025
    What does Error Code E291 mean on my Navien NFB-175H?
    • D
      Diana BarronSep 8, 2025
      Error Code E291 indicates a supply/return inversion limit. Try a manual reset.
  • D
    Dr. Carlos MarquezSep 2, 2025
    What does Error Code E109 mean on my Navien NFB-175H?
    • J
      jcraigSep 2, 2025
      Error Code E109 indicates abnormal operation of the fan motor. Try a manual reset.
  • S
    Sean DickersonAug 31, 2025
    What does Error Code E302 mean on my Navien NFB-175H?
    • K
      Kevin BerryAug 31, 2025
      Error Code E302 indicates low water pressure. Try a manual reset.

Navien NFB-175H Specifications

General IconGeneral
ModelNFB-175H
Heating Capacity175, 000 BTU/h
Input (BTU/h)175, 000 BTU/h
Efficiency (AFUE)95%
Modulation Ratio5:1
Fuel TypeNatural Gas
Gas Connection Size3/4"
Vent Size (inches)2"
CategoryCondensing Boiler
Venting2" PVC/CPVC

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