Navien NCB-180 - Service Manual

Other manuals for Navien NCB-180

Installation & Operation Manual77 pages

User's Information Manual26 pages

Quick Installation Guide4 pages

Manual2 pages

Questions and Answers

S
Sarah Rodriguez MDAug 20, 2025
Why is my Navien NCB-180 Boiler space heating not working?
- K
  Kimberly WilsonAug 20, 2025
  If you are experiencing issues with the space heating side of your Navien Boiler, here are a few things to check: * Ensure the boiler is powered on and not in standby mode by pressing the Power button and raising the setting temperature. * Verify the setting temperature is appropriately set. * Confirm the system isn't currently running for domestic hot water (DHW), as the heating side will not function simultaneously. * Inspect and clean the filters on the heating side to ensure they are not restricted.
S
Susan StephensAug 22, 2025
Why is the water from my Navien NCB-180 not hot enough?
- Z
  Zoe JohnsonAug 22, 2025
  If the water from your hot water faucet isn't hot enough when using your Navien Boiler, check the boiler’s temperature setting and also check for cross plumbing between the cold and hot water lines.
L
Leah HughesAug 25, 2025
What to do if cold water is coming out when the hot water is opened in Navien NCB-180 Boiler?
- A
  Anthony JonesAug 25, 2025
  If you're getting cold water when you expect hot water from your Navien Boiler, first ensure that the shut-off valves on both the hot and cold water pipes are fully open. Also, if an error code is displayed on your boiler, consult the section on understanding error codes for further guidance.
S
Shane ShermanAug 26, 2025
Why is the set temperature too low on my Navien NCB-180?
- D
  Dylan HouseAug 26, 2025
  If your Navien boiler isn't providing the expected temperature, check the boiler's temperature setting. Also, inspect your plumbing for any cross-connections between the cold and hot water lines, as this can affect the water temperature.
P
parkerbradleyAug 27, 2025
What to do if the set temperature is too high on Navien Boiler?
- J
  Jessica ValdezAug 27, 2025
  If the set temperature on your Navien Boiler is too high, check the boiler's temperature setting.
P
pamelaknappAug 29, 2025
What to do if there is no power to Navien NCB-180?
- J
  Jessica ParkerAug 29, 2025
  To resolve power issues with your Navien Boiler: * Ensure the power is on and that the boiler is plugged into an outlet with the correct voltage. * Press the Power button and increase the setting temperature. * Make sure the boiler is turned on.
L
Lori PruittAug 31, 2025
How to fix E003 error on Navien Boiler?
- J
  Jeremy HaneyAug 31, 2025
  If the Navien Boiler displays error code E003, which indicates an ignition failure, make sure that the main gas supply valve is open.
J
Joseph SavageSep 2, 2025
What to do if Navien NCB-180 Boiler shows E016 error?
- J
  josephwyattSep 2, 2025
  If the Navien Boiler displays error code E016, signaling overheating of the heat exchanger: * Turn off the system for at least 30 minutes, and then restart it. * Clean the Heating Return filter. * Flush the heat exchanger.
J
Jade HubbardSep 4, 2025
Why does my Navien NCB-180 Boiler show E110 error?
- J
  Jason FigueroaSep 4, 2025
  If the Navien Boiler displays error code E110, which means abnormal air pressure, ensure that the exhaust pipe is free of obstructions and clean the intake air filter.
C
Christopher TurnerSep 6, 2025
How to resolve E012 error on Navien NCB-180 Boiler?
- J
  juliaguzmanSep 6, 2025
  If the Navien Boiler displays error code E012, indicating flame loss, you should clean the intake air filter and ensure that the electrical cord is properly grounded.

Summary

Getting Service

1. Safety Information

1.4 Safety Precautions

Provides general safety precautions regarding flammable materials and vapors.

COMPROMISED VENTING SYSTEM

Precautions and checks for a compromised venting system to ensure safe operation.

WHAT TO DO IF YOU SMELL GAS

Instructions on what to do if you smell gas to prevent fire or explosion.

HOT WATER TEMPERATURE SETTING

INSTALLATION REQUIREMENTS

IMPORTANT SAFETY PRECAUTIONS

Provides crucial safety precautions for operating and servicing the Navien boiler.

GAS CONVERSION

General Warnings

General Cautions

2. Product Information

3. Technical Data

3.1 General Specifications

4. System Details

4.1 Setting the DIP Switches

4.1.1 Circuit Board DIP Switches

Circuit Board DIP Switches (Set of 8)

Front Panel DIP Switches (Set of 10)

Front Panel DIP Switches (Set of 2)

4.2 Measuring the Inlet Gas Pressure

4.3 Gas Conversion

Gas;Air Ratio Adjustment

4.4.3 Turning Boiler On or Off

4.4.5 Error Display and Reset

How to display and reset error codes on the boiler's front panel.

4.4.6 Adjusting Space Heating Temperature

4.4.7 Adjusting DHW Temperature

4.4.9 Error History Display

4.4.11 Special Parameter Mode

Instructions for accessing and modifying special parameter settings for boiler operation.

4.4.12 Factory Reset

4.6 Error Codes

List of error codes and their corresponding conditions for the boiler.

4.9 Key Components Description

4.9.1 PCB

4.9.2 High Limit Switch

4.9.3 Thermistor

4.9.4 Fan Motor

4.9.5 Flame Rod Assembly

4.9.6 Ignition Transformer

4.9.7 APS

4.9.8 Main Gas Valve

4.9.9 Burner

4.9.10 Flow Sensor

4.9.11 Primary Heat Exchanger

4.9.12 Secondary Heat Exchanger

4.9.13 DHW Heat Exchanger

4.9.14 Circulation Pump

4.9.15 3-Way Valve

4.9.16 Water Pressure Sensor

4.9.17 Auto feeder Valve

5. Troubleshooting

5.1 Error Code Classification

Classifies error codes by system, lists error codes, levels, functions, and actions.

5.2 Error Code List

Detailed list of error codes, their functions, and self-diagnostic/action steps.

5.2.1 003 Error: Ignition Failure

Troubleshooting steps for ignition failure (Error E003).

5.2.2 004 Error: False Flame Detection

Troubleshooting steps for false flame detection (Error E004).

5.2.3 012 Error: Flame Loss

Troubleshooting steps for flame loss (Error E012).

5.2.4 016 Error: Overheat

Troubleshooting steps for overheat (Error E016).

5.2.5 030 Error: Exhaust Gas Temperature

Troubleshooting steps for exhaust gas temperature error (Error E030).

5.2.6 046 Error: Heat Exchanger Thermistor

Troubleshooting steps for heat exchanger thermistor error (Error E046).

5.2.7 047 Error: Exhaust Thermistor

Troubleshooting steps for exhaust thermistor error (Error E047).

5.2.8 060 Error: Dual Venturi

Troubleshooting steps for Dual Venturi error (Error E060).

5.2.9 109 Error: Fan Motor RPM

Troubleshooting steps for fan motor RPM error (Error E109).

5.2.10 110 Error: Air Pressure

Troubleshooting steps for air pressure error (Error E110).

5.2.11 205 Error: Heat Exchanger Output Sensor

Troubleshooting steps for heat exchanger output sensor error (Error E205).

5.2.12 218 Error: Heat Exchanger Input Sensor

Troubleshooting steps for heat exchanger input sensor error (Error E218).

5.2.13 351 Error: Auto Feeder Valve

Troubleshooting steps for abnormal auto feeder valve (Error E351).

5.2.14 352 Error: High Water Pressure

Troubleshooting steps for high water pressure (Error E352).

5.2.15 353 Error: Water Pressure Sensor

Troubleshooting steps for abnormal water pressure sensor (Error E353).

5.2.16 407 Error: DHW Outlet Thermistor

Troubleshooting steps for hot water outlet thermistor error (Error E407).

5.2.17 421 Error: Cold Water Inlet Thermistor

Troubleshooting steps for cold water inlet thermistor error (Error E421).

5.2.18 439 Error: Flow Sensor

Troubleshooting steps for flow sensor error (Error E439).

5.2.19 515 Error: PCB;Electrical Supply

Troubleshooting steps for PCB internal circuit error (Error E515).

5.2.20 517 Error: DIP Switch Setting

Troubleshooting steps for DIP SW setting error (Error E517).

5.2.21 594 Error: PCB Communication

Troubleshooting steps for abnormal PCB communication (Error E594).

5.2.22 615 Error: Abnormal Signal Input

Troubleshooting steps for abnormal signal input by PCB (Error E615).

5.2.23 740 Error: Outdoor Sensor

Troubleshooting steps for abnormal outdoor sensor (Error E740).

5.2.24 777 Error: LWCO Installation

Troubleshooting steps for LWCO installation error (Error E777).

5.2.25 782 Error: Panel Connection

Troubleshooting steps for front panel to PCB connection error (Error E782).

5.3 Troubleshooting guide by symptom

5.3.1 Noise Troubleshooting

5.3.2 Water Temperature Issues

5.3.3 Circuit Breaker Operation

6. Replacement of Parts

6.1 Replacement Procedure

6.2 Components Replacement Instructions

6.2.1 PCB

6.2.7 Main Gas Valve

8. Inspection and Maintenance Schedule

8.1 Annual Servicing

Navien NCB-180 Specifications

General

Fuel Type	Natural Gas or Propane
Maximum Input	180, 000 BTU/h
Minimum Input	18, 000 BTU/h
Heating Capacity	180, 000 BTU/h
Water Connection Size	3/4" NPT
Gas Connection Size	3/4" NPT
Vent Type	Direct Vent
Domestic Hot Water Flow Rate at 35°F	8.4 GPM
AFUE	95%
Vent Size	2 inch or 3 inch
Electrical Requirements	120V AC, 60Hz