Navien NP Condensing Tankless Gas Water Heater - Service Manual

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5.16. 32Error Error occurrence conditions and check items. Error 32E Direct water temperature sensor open Check items Description If an error (open: -14or lower) in the cold water temperature sensor is detected, the system displays the 32E (cleared automatically) error message on the room controller and the PCB. The boiler maintains the Safety-Shutdown status. 1. Check if the cold water temperature sensor is open and if the connector is connected properly. 2. Check the defect of the direct temperature sensor. 3. Defective PCB 4. Check dipswitch settings(Non-A/A Model) Check method Error Defective sensor Cause Defective temperature sensor connector Temperature sensor Check method Check if the cold water temperature sensor is open and if the connector is connected properly. Measure the temperature sensor resistance. (Defective if it is 30or higher) Replace the temperature sensor if the resistance is abnormal. Other trouble Defective PCB If the trouble continues despite the checking of above items, replace the PCB. Error type : MΩ Open ©Navien America Inc. 2010 102 NR/NP series service Manual Version 2.0
5.17. 33Error Error occurrence conditions and check items. Error 33E Direct water temperature sensor short-circuit Check items Description If an error (open: 248or higher) in the cold water temperature sensor is detected, the system displays the 33E (cleared automatically) error message on the remote controller and the PCB. The boiler maintains the Safety-Shutdown status. 1. Check if the hot water temperature sensor connector is wet due to any reason, including leakage. 2. Replace the defected cold water temperature sensor. 3. Replace the PCB. Check method Error Defective sensor Cause Defective temperature sensor connector Temperature sensor Check method Check if the hot water temperature sensor connector or the PCB harness terminal is wet due to any reason, including leakage. Measure the temperature sensor resistance. Replace the sensor if it is 0 Ω. Other trouble Defective PCB If the trouble continues despite the checking of above items, replace the PCB. < Direct water temperature sensor / Blue 2P > < Check the hot water temperature sensor > ©Navien America Inc. 2010 103 NR/NP series service Manual Version 2.0
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Service Manual Service Manual Servi
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4.4.2. NP-A Model 37 4.4.3. NR Mode
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8.2.8. Manifold 143 8.2.9. Main Gas
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Navien Warranty CAUTION This produc
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WARRANTY EXCLUSIONS This warranty d
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Abbreviation and Definition Abbrevi
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1.4. Safety Precautions DANGER FLAM
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DANGER WHAT TO DO IF YOU SMELL GAS
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GAS TYPE and AC VOLTAGE WARNING Nav
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2.2. Layout and Key Components 2.2.
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2.2.3. NR Model No Description Navi
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3. Technical Data 3.1. General Spec
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3.2.2. NR, NP Model 1) Connection D
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4.1.2. NP-A Model Exhaust pipe inta
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4.1.3. NR Model Exhaust pipe Intake
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YES GPS normal? YES MGV ON NO Lock-
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B Lock-out Outlet Thermistor >= 208
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4.3. Dip Switch Settings There are
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4.4. Wiring Diagram 4.4.1. NR-A Mod
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4.4.3. NR Model ©Navien America In
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4.5. Electrical Diagnostic Points G
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Point Function Wire Color Normal Va
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4.6.2. Thermal Fuse Navien Part No.
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4.6.4. High Limit Switch or Exhaust
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4.6.6. Fan motor Navien Part No. Fu
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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
Page 60 and 61: 4.6.16. Primary Heat Exchanger Navi
Page 62 and 63: 4.6.18. Buffer Tank (“A” Series
Page 64 and 65: 4.6.20. Bypass Mixing Valve (“Non
Page 66 and 67: Error Code E021 Reason Cold water i
Page 68 and 69: Check method Error type Cause The m
Page 70 and 71: Scenario 1 Is the igniter normally
Page 72 and 73: Check method Error type Cause Check
Page 74 and 75: Solenoid valve Proportional valve A
Page 76 and 77: To the direction of air supply hose
Page 78 and 79: Check method Error type Flame befor
Page 80 and 81: Check method Error type Sensor erro
Page 82 and 83: Check method Error type Sensor erro
Page 84 and 85: Does the fan moter have normal oper
Page 86 and 87: 5.8. 10Error Error occurrence condi
Page 88 and 89: Check method Error type Cause Check
Page 90 and 91: 5.9. 12Error Error occurrence condi
Page 92 and 93: Off at switch of stage Defective ai
Page 94 and 95: 5.11. 16Error Error occurrence cond
Page 96 and 97: Temperature fuse > < Check if the t
Page 108 and 109: Emergency measures against closed f
Page 110 and 111: Check method Error type Defective s
Page 118 and 119: 1. Drain water, and unfasten the up
Page 120 and 121: Check method Error type Defective s
Page 122 and 123: Check the connection of wire to wir
Page 126 and 127: 5.27. Troubleshooting guide by symp
Page 128 and 129: 5.27.2. Hot water Error Cause Remot
Page 130 and 131: 6. Inspection Check and clean the h
Page 132 and 133: 6.2.2. Adjusting the Gas-Air Ratio
Page 134 and 135: 7. Maintenance Describe precautions
Page 136 and 137: 7.3. Flushing the Heat Exchanger Fo
Page 138 and 139: 8.2. Components Replacement Instruc
Page 140 and 141: 8.2.3. Transformer 1. Turn off the
Page 142 and 143: 8.2.5. Flame Rod 1. Turn off the ga
Page 144 and 145: 8.2.7. APS 1. Turn off the gas supp
Page 146 and 147: WARNING Failure to correctly assemb
Page 148 and 149: WARNING Failure to correctly assemb
Page 150 and 151: 8.2.11. Condensation Trap 1. Turn o
Page 152 and 153: 8.2.13. Flow Sensor 1. Turn off the
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8.2.15. Circulation Pump (“A”Se
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8.2.16. 3-way Valve (“A” Series
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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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