Navien NP Condensing Tankless Gas Water Heater - Service Manual

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To the direction of air supply hose Air supply pipe < Example of flue installation > Other trouble Defective PCB If the trouble continues despite the checking of above items, replace the PCB. Mainfold disassembly procedure 1. Remove 4 screws and remove the ignition transformer and the venture 2. Remove 6 screws (2 under and 4 upper). 3. Remove 2 manifold fixing screws. 4. Remove multi-stage valve. 5. Use a screw driver to remove the valve. Stage 2 Stage 1 Stage 3 6. Disassemble the manifold. 7. Check the nozzles. ©Navien America Inc. 2010 74 NR/NP series service Manual Version 2.0
5.2. 04Error Error occurrence conditions and check items. Error Description 04E False-flame detection 1. Pre ignition false-flame If a flame signal is detected continuously for 6 seconds before combustion (stand-by, pre-purge, pre-ignition), a false-flame error 04E (automatically cleared) is dis-played on the thermostat, and the system performs continuous post-purge and operates the pump. 2. Post purge false-flame If a flame signal is detected continuously for 6 seconds when the system performs post-purge as fuel supply is stopped, a false-flame error 04E (automatically cleared) is displayed on the thermostat, and the system performs continuous post-purge and operates the pump. Check items 1. Check if gas leaks due to defective air sealing of the main gas valve. 2. Check if electricity is discharged from the electrode. 3. Check if gas is supplied at higher pressure than the standard gas pressure. 4. Defective PCB. Is the flame detected during no burner openrarion? No Clean or replace flame rod Yes Check the current of CN 19: 7-20μA Check the voltage between two wires of CN 19: 10-20VDC Replace PCB ©Navien America Inc. 2010 75 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
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
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 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
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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
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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
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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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