Table Of Contents - Navien NHB-055 Service Manual

Contents
1. Safety Information
1.1 Safety Definitions
1.2 Safety Symbols
1.3 Symbols Used in the Instructions
1.4 Safety Precautions
2. Product Information
2.1 Product Information Items
2.2 Components
3. Technical Data
3.1 General Specifications
3.2 Dimensions
4. System Details
4.1 Setting the DIP Switches
4.1.1 PCB DIP Switches
4.1.2 Front Panel DIP Switches
4.2 Measuring the Inlet Gas Pressure
4.2.1 Gas Pipe Sizing Tables
4.3 Gas Conversion
4.4 The Front Panel
4.4.1 LCD Display
4.4.2 Buttons
4.4.3 Turning the Boiler On or Off
4.4.4 Normal Operation
4.4.5 Error Display and RESET
4.4.6 Adjusting the Space Heating Temperature
4.4.7 Adjusting the DHW Temperature
4.4.8 Viewing Basic Information (For Homeowner)
4.4.9 Error occurrence history display
4.4.10 Information display (for servicer)
4.4.11 Special Parameter mode
4.4.12 Resetting the Boiler (Factory Reset)
Version 1.0
9
4.5 Version Display
4.6 Error Code
9
4.7 Ladder Diagram
9
4.8 Electrical Diagnostic Point & Wiring Diagram
9
4.9 Key Components Description
9
4.9.1 PCB
4.9.2 High Limit Switch
13
4.9.3 Thermistor
13
4.9.4 Fan Motor
14
4.9.5 Flame Rod Assembly
4.9.6 Ignition Transformer
4.9.7 APS
16
4.9.8 Main Gas Valve
16
4.9.9 Burner
18
4.9.10 Primary Heat Exchanger
4.9.11 Secondary Heat Exchanger
19
4.9.12 Water Pressure Sensor
4.9.13 Dual Venturi
19
19
20
5. Troubleshooting
21
5.1 Error code classification
23
5.2 Error code classification
25
5.2.1 001Error
31
5.2.2 003Error
31
5.2.3 004Error
32
5.2.4 012Error
34
5.2.5 016Error
34
5.2.6 030Error
36
5.2.7 046Error
36
5.2.8 047Error
37
5.2.9 060Error
38
5.2.10 109Error
40
5.2.11 110Error
41
5.2.12 205Error
48
5.2.13 218Error
60
5.2.14 271Error
61
61
62
63
65
65
66
67
68
69
70
71
72
73
74
75
76
77
78
78
79
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NHB Service Manual 3