Navien NP Condensing Tankless Gas Water Heater - Service Manual

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5.11. 16Error Error occurrence conditions and check items. Error Description 16E Bimetal overheated If the overheat controller on the heat exchanger operates during combustion stop of the boiler, the system displays the 16E (manually cleared) message on the remote controller and the PCB. The boiler switches into Lock-Out, and performs postpurge continuously and operates the pump. If the overheat sensor signal is detected within 10 min after the combustion is stopped, no error is displayed, and the system does not start combustion until the overheat sensor is returned to normal. Check items 1. Check if the main heat exchanger is clogged. 2. Check if the overheat controller works properly. 3. Check the hot water output/input temperature sensor. 4. Check the PCB DIP S/W capacity setting. 5. Check if the PCB works properly. Is HTL* normally operation? No Replaace HTL Yes Replace PCB Check the resistance betweenteo white wires of CN 13: short-circuit(016E) Check the resistance betweenteo white wires of CN 13: short-circuit(030E) Caution: Measuning should be done at leat 30 minutes after error. ©Navien America Inc. 2010 92 NR/NP series service Manual Version 2.0
Check method Error type Cause Check method The main heat exchanger is clogged. Separate inlet/outlet pipe of the main heat exchanger, and blow air with mouth to check if the pipe is clogged. Thudding noise caused by circulation error Defective overheat PCB Check if the contact point of the overheat PCB is defective. Use a tester to see if the resistance is normal (0 Ω) or abnormal (∞). Defective safety device Defective safety device The temperature fuse is disconnected. Check, with a tester, if the temperature fuse is disconnected. If the fuse is disconnected, replace the part and check the cause of overheating. ©Navien America Inc. 2010 93 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
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
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 96 and 97: Temperature fuse > < Check if the t
Page 98 and 99: 5.13. 22Error Error occurrence cond
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
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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
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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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