©Navien America Inc. 2010 NR/NP series service Manual
2
Version 2.0
4.4.2. NP-A Model 37
4.4.3. NR Model 38
4.4.4. NP Model 39
4.5. ELECTRICAL DIAGNOSTIC POINTS 40
4.6. KEY COMPONENTS DESCRIPTION 43
4.6.1. PCB 43
4.6.2. Thermal Fuse 44
4.6.3. Transformer 45
4.6.4. High Limit Switch or Exhaust Limit Switch 46
4.6.5. Thermistor 47
4.6.6. Fan motor 48
4.6.7. Flame Rod Ass’y 49
4.6.8. Ignition Transformer 50
4.6.9. APS 51
4.6.10. Manifold 52
4.6.11. Main Gas Valve 53
4.6.12. GPS 54
4.6.13. Burner 55
4.6.14. Water Adjustment Valve 56
4.6.15. Flow Sensor 57
4.6.16. Primary Heat Exchanger 58
4.6.17. Seconary Heat Exchanger 59
4.6.18. Buffer Tank (“A” Series) 60
4.6.19. Circulation Pump (“A” Series) 61
4.6.20. Bypass Mixing Valve (“Non-A” Series) 62
5. TROUBLESHOOTING 63
5.1. ERROR CODE LIST 63
5.2. 01ERROR 65
5.3. 03ERROR 67
5.4. 04ERROR 75
5.5. 07ERROR 77
5.6. 08ERROR 79
5.7. 09ERROR 81
5.8. 10ERROR 84
5.9. 12ERROR 88
5.10. 15ERROR 91
5.11. 16ERROR 92
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