©Navien America Inc. 2010CH series service Manual
3
Version 1.0
5.22. 28ERROR 100
5.23. 30ERROR 102
5.24. 35ERROR 103
5.25. 36ERROR 105
5.26. 39ERROR 106
5.27. 40ERROR 107
5.28. TROUBLESHOOTING GUIDE BY SYMPTOM 108
5.28.1. Noise 108
5.28.2. Hot water 109
5.28.3. Space Heating 110
6. INSPECTION 112
6.1. PREPARING THE BOILER FOR INSPECTION 112
6.2. MEASURING GAS PRESSURE SETTING 113
6.2.1. How to Check Inlet Gas Pressure 113
6.2.2. Adjusting the Gas-Air Ratio 114
7. MAINTENANCE 116
7.1. DRAINING THE BOILER 116
7.2. CLEANING THE INTAKE AIR FILTER 117
7.3. FLUSHING THE HEAT EXCHANGER 117
8. REPLACEMENT OF PARTS 118
8.1. REPLACEMENT PROCEDURE 118
8.2. COMPONENTS REPLACEMENT INSTRUCTIONS 119
8.2.1. PCB 119
8.2.2. Fuse 120
8.2.3. Transformer 121
8.2.4. Fan Motor(Combustion Air ) 122
8.2.5. Flame Rod 123
8.2.6. Ignition Transformer 124
8.2.7. APS 125
8.2.8. Manifold 126
8.2.9. Main Gas Valve 127
8.2.10. GPS 129
8.2.11. Condensation Trap 130
8.2.12. Flow Sensor 131
8.2.13. Circulation Pump 132
8.2.14. 3-way Valve 133
8.2.15. Water Pressure Sensor 134
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