Navien NP Condensing Tankless Gas Water Heater - Service Manual

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Check method Error type Cause Check method 10E occurs intermittently Air supply / exhaust close program is changed. 1. If 10E occurs intermittently during ignition or combustion, compare the stan-dard RPM (o.000) with the current RPM (r.000) at Min / Max combustion(dip switch 1-1&2). If the current RPM is near the excessive air pressure condition, check the follows: Air supply / exhaust Drainage of condensed water If the air pressure hose is broken or clogged. 2. Replace the old controller with a new one (change the program). Air pressure sensor error Air pressure hose error, venturi clogged 1. The air pressure hose is clogged. Check if the hose is clogged with water remained from installation. 2. Check if the venturi (burner) hole is clogged with soot or foreign substance. Blow air with mouth through the air pressure hose. 3. Check if the air pressure hose is torn. Increased RPM may cause blowout and noise. 03E can occur due to the same trouble. Defective heat exchanger The air pressure sensor error occurs due to heat leaked from the heat exchanger. Check if the error occurs continuously after the air volume sensor is replaced. After 5 min from the start of the boiler, put your hand near the air pressure sensor, and check if you can feel the heat. Condensed water drain error < Check if the venturi is clogged.> < Defective air pressure hose > Condensed water drain error Air pressure error Condensed water drain error Defective blower Exhaust air is locked out due to condensed water drain error. Check if the condensed water hose or the siphon is frozen. Check if the condensed water hose is folded. Remove bottom of trap and verify it is not plugged 1. Replace the blower if the blower RPM is considerably low. 2. Check the blower rpm displayed on the controller. (r.3203200 rpm) ©Navien America Inc. 2010 86 NR/NP series service Manual Version 2.0
Defective air supply/exhaust flue Deformed or clogged flue 1. Check the exterior of the flue, including dent. 2. Check if rainwater is collected due to downward installation of air supply pipe. To the direction of air supply hose Air supply pipe < Example of installation of air supply flue > Exhaust gas flows in through the supply pipe If the exhaust gas glows in through the air supply pipe, imperfect combustion may cause 10E due to noise and instable APS and RPM. Check the installation of flue and if the standard flue is used. Other error Defective PCB If the same trouble continues after reviewing of the above items, 1. replace the air pressure sensor in case the air pressure sensing standard is abnormal, or 2. Replace the PCB. ©Navien America Inc. 2010 87 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
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
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 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
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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
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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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