Navien NP Condensing Tankless Gas Water Heater - Service Manual

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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 ©Navien America Inc. 2010 2 NR/NP series service Manual 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 ©Navien America Inc. 2010 3 NR/NP series service Manual Version 2.0
Page 1: Service Manual Service Manual Servi
Page 6 and 7: 8.2.8. Manifold 143 8.2.9. Main Gas
Page 8 and 9: Navien Warranty CAUTION This produc
Page 10 and 11: WARRANTY EXCLUSIONS This warranty d
Page 12 and 13: Abbreviation and Definition Abbrevi
Page 14 and 15: 1.4. Safety Precautions DANGER FLAM
Page 16 and 17: DANGER WHAT TO DO IF YOU SMELL GAS
Page 18 and 19: GAS TYPE and AC VOLTAGE WARNING Nav
Page 20 and 21: 2.2. Layout and Key Components 2.2.
Page 22 and 23: 2.2.3. NR Model No Description Navi
Page 24 and 25: 3. Technical Data 3.1. General Spec
Page 26 and 27: 3.2.2. NR, NP Model 1) Connection D
Page 28 and 29: 4.1.2. NP-A Model Exhaust pipe inta
Page 30 and 31: 4.1.3. NR Model Exhaust pipe Intake
Page 32 and 33: YES GPS normal? YES MGV ON NO Lock-
Page 34 and 35: B Lock-out Outlet Thermistor >= 208
Page 36 and 37: 4.3. Dip Switch Settings There are
Page 38 and 39: 4.4. Wiring Diagram 4.4.1. NR-A Mod
Page 40 and 41: 4.4.3. NR Model ©Navien America In
Page 42 and 43: 4.5. Electrical Diagnostic Points G
Page 44 and 45: Point Function Wire Color Normal Va
Page 46 and 47: 4.6.2. Thermal Fuse Navien Part No.
Page 48 and 49: 4.6.4. High Limit Switch or Exhaust
Page 50 and 51: 4.6.6. Fan motor Navien Part No. Fu
Page 52 and 53: 4.6.8. Ignition Transformer Navien
Page 54 and 55:
4.6.10. Manifold PABCR180AMF_001 Na
Page 56 and 57:
4.6.12. GPS Navien Part No. Functio
Page 58 and 59:
4.6.14. Water Adjustment Valve Navi
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4.6.16. Primary Heat Exchanger Navi
Page 62 and 63:
4.6.18. Buffer Tank (“A” Series
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4.6.20. Bypass Mixing Valve (“Non
Page 66 and 67:
Error Code E021 Reason Cold water i
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Check method Error type Cause The m
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Scenario 1 Is the igniter normally
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Check method Error type Cause Check
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Solenoid valve Proportional valve A
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To the direction of air supply hose
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Check method Error type Flame befor
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Check method Error type Sensor erro
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Check method Error type Sensor erro
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Does the fan moter have normal oper
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5.8. 10Error Error occurrence condi
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Check method Error type Cause Check
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5.9. 12Error Error occurrence condi
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Off at switch of stage Defective ai
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5.11. 16Error Error occurrence cond
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Temperature fuse > < Check if the t
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Emergency measures against closed f
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Check method Error type Defective s
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1. Drain water, and unfasten the up
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Check method Error type Defective s
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Check the connection of wire to wir
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5.27. Troubleshooting guide by symp
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5.27.2. Hot water Error Cause Remot
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6. Inspection Check and clean the h
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6.2.2. Adjusting the Gas-Air Ratio
Page 134 and 135:
7. Maintenance Describe precautions
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7.3. Flushing the Heat Exchanger Fo
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8.2. Components Replacement Instruc
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8.2.3. Transformer 1. Turn off the
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8.2.5. Flame Rod 1. Turn off the ga
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8.2.7. APS 1. Turn off the gas supp
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WARNING Failure to correctly assemb
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WARNING Failure to correctly assemb
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8.2.11. Condensation Trap 1. Turn o
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8.2.13. Flow Sensor 1. Turn off the
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8.2.15. Circulation Pump (“A”Se
Page 156 and 157:
8.2.16. 3-way Valve (“A” Series
Page 158 and 159:
8.2.18. Bypass Mixing Valve (“Non
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NO Description Navien Part No. Rema
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9.3. Water Way Disassemble (NR-A)
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9.5. Water Way Disassemble (NP-A)
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10.2. Inspection Report Inspection
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Memo ©Navien America Inc. 2010 172
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Navien NP Condensing Tankless Gas Water Heater - Service Manual

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