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Navien Manuals
Boiler
NCB500-2S/37K
Service manual
Table Of Contents - Navien NCB500-2S/37K Service Manual
Condensing combi boiler
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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Contents
1. Safety Information
2. Product Information
2.1 Product Information
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
4.3 Gas Conversion
4.4 Using the Front Panel
4.4.1 Icons and Digital Display
4.4.2 Buttons
4.4.3 Turning the Boiler On or Off
4.4.4 Start-Up Wizard
4.4.5 Adjusting the Temperature
4.4.6 Resetting the Boiler
4.4.7 Accessing Basic Menu Items
4.4.8 Accessing Advanced Menu Items
4.5 Wiring Diagram
4.6 Ladder Diagram
4.7 Key Component Descriptions
4.7.1 PCB
4.7.2 High Temperature Limit Switch
4.7.3 Thermistor
4.7.4 Fan Motor
4.7.5 Flame Rod Assembly
4.7.6 Ignition Transformer
4.7.7 Main Gas Valve
4.7.8 Burner
4.7.9 Flow Sensor
4.7.10 Primary Heat Exchanger
4.7.11 Secondary Heat Exchanger
4.7.12 DHW Heat Exchanger
4.7.13 Circulation Pump
4.7.14 3 Way Valve
4.7.15 Water Pressure Sensor
4.7.16 Expansion tank
5. Troubleshooting
5.1 Error Code Classification
5.2 Error Code List and Actions
5.2.1 Error
001
5.2.2 Error 003
5.2.3 Error
004
5.2.4 Error
012
5.2.5 Error
016
4
Contents
7
5.2.6 Error
030
5.2.7 Error
031
5.2.8 Error
046
11
5.2.9 Error 047
5.2.10 Error
109
11
5.2.11 Error
205
12
5.2.12 Error
218
5.2.13 Error
302
14
5.2.14 Error
352
5.2.15 Error
353
14
5.2.16 Error
407
16
5.2.17 Error
421
5.2.18 Error
515
17
5.2.19 Error
517
5.2.20 Error 594
17
5.2.21 Error 615
17
5.2.22 Error
740
17
5.2.23 Error 782
18
5.3 Troubleshooting guide by symptom
19
5.3.1 Noise
5.3.2 Water Temperature Issue
24
5.3.3 Circuit breaker operation
24
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6. Replacement of Parts
26
26
6.1 Replacement Procedure
26
6.2 Components Replacement Instructions
27
6.2.1 PCB
28
6.2.2 Fuse
33
6.2.3 Fan Motor (Combustion Air)
38
6.2.4 Flame Rod
39
6.2.5 Ignition Transformer
6.2.6 Main Gas Valve
40
6.2.7 Condensate Trap
40
6.2.8 Circulation Pump
41
6.2.9 Flow Sensor
42
6.2.10 3-way Valve
43
6.2.11 Water Pressure Sensor
44
6.2.12 DHW Heat exchanger
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7. Components Diagram and Part List
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7.1 Case Assembly
49
7.2 Burner Assembly
50
7.3 Waterway Assembly
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8. Inspection and Maintenance Schedule
54
8.1 Annual Servicing
55
8.2 Maintenance Report
56
8.3 Maintenance Schedules
56
8.4 Inspection Report
57
8.5 Routine Servicing
60
8.5.1 Interim Service
62
8.5.2 Full Service
68
8.5.3 CO and Combustion Checks
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Table of Contents
Troubleshooting
Troubleshooting
57
Troubleshooting guide by symptom
92
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Ncb500-2s+/41k
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