Navien NCB-210E Service Manual

Getting Service
If your boiler requires service, you have several options for getting service:
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Contact Technical Support at 1-800-519-8794 or on the website: www.navienamerica.com.
For warranty service, always contact Technical Support first.
●
Contact the technician or professional who installed your boiler.
●
Contact a licensed professional for the affected system (for example, a plumber or electrician).
When you contact Technical Support, please have the following information at hand:
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Model number
●
Serial number
●
Date purchased
●
Installation location and type
●
Error code, if any appears on the front panel display.
Navien, Inc.
800.519.8794
www.Navien.com
20 Goodyear lrvine, CA 92618
Service Manual
NCB-E Condensing Combi Boiler
THE LEADER IN CONDENSING TECHNOLOGY
Version: 1.4 (Oct 26, 2015)

Navien NCB-210E Specifications

General

Brand	Navien
Model	NCB-210E
Category	Boiler
Language	English

Summary

Getting Service

Warranty Information

Warranty Exclusions

Safety Information

Compromised Venting System Dangers

Hazards associated with improper or damaged venting systems.

Installation Requirements and Safety

Safety considerations related to installation and local codes.

Gas Leak Safety Procedures

Actions to take if a gas leak is detected.

Important Safety Precautions

Critical safety instructions before operating or servicing.

Safety Precautions

Specific safety measures to prevent hazards.

Product Information

Technical Data

System Details

DIP Switch Settings

Instructions for setting DIP switches on the circuit board.

Front Panel DIP Switch Configuration

Guide to setting DIP switches on the front panel for various functions.

Measuring Inlet Gas Pressure

Gas Conversion Procedure

Front Panel Operation

Icons and Digital Display Guide

Interpretation of icons and digital display information on the panel.

Front Panel Buttons and Functions

Description of each button and its function on the front panel.

Error Display and Reset Procedures

How to view and reset error codes on the front panel.

Adjusting DHW Temperature

Procedure for setting the domestic hot water temperature.

Error Occurrence History Display

How to access and interpret the history of recorded errors.

Special Parameter Mode Access

Instructions for entering the special parameter adjustment mode.

Boiler Factory Reset Procedure

Steps to reset the boiler to its factory default settings.

Normal Operating Mode

Details of the boiler's status during normal operation.

Adjusting Space Heating Temperature

Steps to set the desired space heating water temperature.

Error Codes Overview

Electrical Diagnostic and Wiring Diagram

Key Components Description

Printed Circuit Board (PCB)

Function, failure events, and diagnostics for the PCB.

High Limit Switch

Function and troubleshooting for the overheat prevention switch.

Thermistor Functionality

Role and resistance values of temperature sensors.

Fan Motor Operation

Description, failure events, and voltage checks for the fan motor.

Flame Rod Assembly

Function, failure events, and gap settings for the flame rod.

Ignition Transformer Details

Function, voltage, and current specifications of the ignition transformer.

Air Pressure Sensor (APS)

Function, failure events, and diagnostic checks for the APS.

Main Gas Valve Function

Role, failure events, and resistance checks for the main gas valve.

Burner System Explanation

Function and diagnostic checks for the pre-mix burner system.

Flow Sensor Operation

Function, failure events, and voltage checks for the flow sensor.

Primary Heat Exchanger Function

Role and troubleshooting for the primary heat exchanger.

Secondary Heat Exchanger Function

Role and troubleshooting for the secondary heat exchanger.

DHW Heat Exchanger Function

Role and troubleshooting for the DHW heat exchanger.

Circulation Pump Operation

Function, failure events, and checks for the circulation pump.

3-Way Valve Functionality

Role, failure events, and voltage checks for the 3-way valve.

Water Pressure Sensor Operation

Function, failure events, and voltage checks for the water pressure sensor.

Auto Feeder Valve Function

Dual Venturi Operation

Troubleshooting Guide

Error Code Classification

Error Code List and Actions

001Error: Heat Exchanger Overheating

003Error: Ignition Failure

004Error: False-Flame Detection

012Error: Flame Loss

016Error: Bimetal Overheated

030Error: Exhaust Gas Temperature

046Error: Heat Exchanger Thermistor

047Error: Exhaust Thermistor

060Error: Dual Venturi Malfunction

109Error: Fan Motor RPM Error

110Error: Air Pressure Error

205Error: Heat Exchanger Output Sensor

218Error: Heat Exchanger Input Sensor

351Error: Abnormal Auto Feeder Valve

352Error: High Water Pressure

353Error: Abnormal Water Pressure Sensor

407Error: Hot Water Outlet Thermistor

421Error: Cold Water Inlet Thermistor

439Error: Flow Sensor Error

515Error: PCB Internal Circuit Fault

740Error: Abnormal Outdoor Sensor

777Error: Abnormal Factory Jumper

782Error: Front Panel Wiring

Troubleshooting by Symptom: Noise

Troubleshooting by Symptom: Water Temperature Issues

517Error: DIP Switch Settings

Troubleshooting by Symptom: Circuit Breaker Operation

594Error: PCB Communication Abnormal

615Error: Abnormal Signal Input

Replacement of Parts

Replacement Procedure Overview

Fuse Replacement

Flame Rod Replacement

Ignition Transformer Replacement

Main Gas Valve Replacement

Condensate Trap Replacement

Circulation Pump Replacement

3-Way Valve Replacement

Water Pressure Sensor Replacement

Space Heating Strainer Maintenance

Components Replacement Instructions

Fan Motor Replacement

APS Replacement

Flow Sensor Replacement

Auto Feeder Valve Replacement

PCB Replacement

DHW Heat Exchanger Replacement

Components Diagram and Part List

Case Assembly Diagram

Burner Assembly Diagram

Waterway Assembly (NCB) Diagram

Waterway Assembly (NCB-E) Diagram

Fan (Gas) Assembly Diagram

Inspection and Maintenance Schedule

Annual Servicing Recommendations