Navien NCB300-28K, Service Manual

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4 Contents
Contents
1. Safety Information 7
2. Product Information 11
2.1 Product Information 11
2.2 Components 12
3. Technical Data 16
3.1 General Specifications 16
3.2 Dimensions 18
4. System Details 19
4.1 Setting the DIP Switches 19
4.1.1 PCB DIP Switches 19
4.1.2 Front Panel DIP Switches 19
4.2 Measuring the Incoming Gas Pressure 20
4.3 Gas Conversion 21
4.4 Using the Front Panel 26
4.4.1 Icons and Digital Display 26
4.4.2 Buttons 27
4.4.3 Turning the Boiler On or Off 28
4.4.4 Adjusting the Temperature 28
4.4.5 Resetting the Boiler 29
4.4.6 Accessing Basic Menu Items 30
4.4.7 Accessing Advanced Menu Items 32
4.5 Wiring Diagram 35
4.6 Ladder Diagram 36
4.7 Key Component Descriptions 37
4.7.1 PCB 37
4.7.2 High Temperature Limit Switch 38
4.7.3 Thermistor 39
4.7.4 Fan Motor 40
4.7.5 Flame Rod Assembly 41
4.7.6 Ignition Transformer 42
4.7.7 Main Gas Valve 43
4.7.8 Burner 44
4.7.9 Flow Sensor 45
4.7.10 Primary Heat Exchanger 46
4.7.11 Secondary Heat Exchanger 47
4.7.12 DHW Heat Exchanger 48
4.7.13 Circulation Pump 49
4.7.14 3 Way Valve 50
4.7.15 Water Pressure Sensor 51
4.7.16 Expansion tank 52
4.7.4 Fan Motor 40
4.7.5 Flame Rod Assembly 41
4.7.6 Ignition Transformer 42
4.7.7 Main Gas Valve 43
4.7.8 Burner 44
4.7.9 Flow Sensor 45
4.7.10 Primary Heat Exchanger 46
4.7.11 Secondary Heat Exchanger 47
4.7.12 DHW Heat Exchanger 48
4.7.13 Circulation Pump 49
4.7.14 3 Way Valve 50
4.7.15 Water Pressure Sensor 51
4.7.16 Expansion tank 52
5. Troubleshooting 53
5.1 Error Code Classification 53
5.2 Error Code List and Actions 54
5.2.1 Error 001 56
5.2.2 Error 003 58
5.2.3 Error 004 64
5.2.4 Error 012 65
5.2.5 Error 016 67
5.2.6 Error 030 69
5.2.7 Error 031 70
5.2.8 Error 046 71
5.2.9 Error 047 71
5.2.10 Error 109 72
5.2.11 Error 205 74
5.2.12 Error 302 76
5.2.13 Error 407 77
5.2.14 Error 515 79
5.2.15 Error 517 80
5.2.16 Error 594 80
5.2.17 Error 615 80
5.2.18 Error 740 81
5.2.19 Error 782 81
5.3 Troubleshooting guide by symptom 82
5.3.1 Noise 82
5.3.2 Water Temperature Issue 83
5.3.3 Circuit breaker operation 84
6. Replacement of Parts 85
6.1 Replacement Procedure 85
6.2 Components Replacement Instructions 85
6.2.1 PCB 85
6.2.2 Fuse 86
6.2.3 Fan Motor (Combustion Air) 87
6.2.4 Flame Rod 88
6.2.5 Ignition Transformer 88
6.2.6 Main Gas Valve 89
6.2.7 Condensate Trap 89
6.2.8 Circulation Pump 90
6.2.9 Flow Sensor 90
6.2.10 3-way Valve 91
6.2.11 Water Pressure Sensor 91
6.2.12 DHW Heat exchanger 92
7. Components Diagram and Part List 93
7.1 Case Assembly 93
7.2 Burner Assembly 94
7.3 Waterway Assembly 95
8. Inspection and Maintenance Schedule 96
8.1 Annual Servicing 96
8.2 Maintenance Report 96
8.3 Maintenance Schedules 96
8.4 Inspection Report
96
8.5 Routine Servicing 97
8.5.1 Interim Service 97
8.5.2 Full Service 99
8.5.3 CO and Combustion Checks 102