©Navien America Inc. 2010 NR/NP series service Manual
3
Version 2.0
5.12. 21ERROR 95
5.13. 22ERROR 96
5.14. 27ERROR 98
5.15. 30ERROR 100
5.16. 32ERROR 102
5.17. 33ERROR 103
5.18. 34ERROR 104
5.19. 35ERROR 107
5.20. 36ERROR 109
5.21. 37ERROR 110
5.22. 38ERROR 112
5.24. 44ERROR 117
5.25. 45ERROR 119
5.26. 48ERROR 122
5.27. TROUBLESHOOTING GUIDE BY SYMPTOM 124
5.27.1. Noise 124
5.27.2. Hot water 126
5.27.3. Circuit breaker operates 127
6. INSPECTION 128
6.1. PREPARING THE WATER HEATER FOR INSPECTION 128
6.2. MEASURING GAS PRESSURE SETTING 129
6.2.1. How to Check Inlet Gas Pressure 129
6.2.2. Adjusting the Gas-Air Ratio 130
7. MAINTENANCE 132
7.1. DRAINING THE WATER HEATER 132
7.2. CLEANING THE INTAKE AIR FILTER 133
7.3. FLUSHING THE HEAT EXCHANGER 134
8. REPLACEMENT OF PARTS 135
8.1. REPLACEMENT PROCEDURE 135
8.2. COMPONENTS REPLACEMENT INSTRUCTIONS 136
8.2.1. PCB 136
8.2.2. Fuse 137
8.2.3. Transformer 138
8.2.4. Fan Motor(Combustion Air Blow) 139
8.2.5. Flame Rod 140
8.2.6. Ignition Transformer 141
8.2.7. APS 142
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