Navien NP Condensing Tankless Gas Water Heater - Service Manual

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5.27.2. Hot water Error Cause Remote controller power off Check method Hot water does not run if the remote controller is switched off. Water heater fails to work Defective flow sensor The water heater does not work due to the defective flow sensor. The impeller does not rotate, if the axis is stuck due to foreign substance. If the impeller rotates normally, replace the hall sensor of the flow sensor. The sensor may be reused temporarily after cleaning, but replacement must be considered preferentially. Defective hot water temperature sensor The temperature is sensed higher than the actual temperature due to a defective hot water (cold water) sensor. Hot water temperature is low although hot water is recognized by the remote controller. The cold temperature sensor may not work without any symptom. Hot water setting error Check the hot water temperature setting on the remote controller. Low hot water temperature Water mixed with cold water. The temperature of hot water at the tap is low while the temperature is high at the hot water outlet. Cold water and hot water are mixed due to improper pipe installation. Cold water and hot water are mixed due to improper installation of the tap. No hot water from the valve Check the pipe 1. The cold water valve is closed. 2. Check if the cold water filter is clogged with foreign substance. 3. The water adjustment valve is closed. (Refer to E34.) 4. Check if the cold water / hot water pipes are frozen during the winter. 5. The main heat exchanger is clogged (by lime) 6. Low inlet water pressure Cold water flows temporally Pre-heating does not work For the A model, the system performs the internal/ external circulation preheating when 24-hour timer is set on the remote controller. Therefore, make sure to check the time setting ©Navien America Inc. 2010 126 NR/NP series service Manual Version 2.0
5.27.3. Circuit breaker operation Error Cause Power supply Check method The circuit breaker operates immediately as soon as the power cord is plugged in the receptacle. Check the sheath of power cord, or if there is short-circuit. Check the devices in the order of the power transformer and the PCB. Defective part assembly If the circuit breaker operates after a repairing work, check the wiring of each part. Mind the direction when assembling the ignition transformer. Be careful that wire is not pressed down when assembling the main gas valve. Check if the wire is fixed and well adjusted on the main side of the heat exchanger. Circuit breaker operates Circuit breaker operates while the boiler is running If circuit breaker operates during the operation of the boiler, check the order of operation, and replace the concerned part. e.g., The circuit breaker operates at switchover to burner stage 3 after ignition. Replace the 3-stage valve. Remote controller power Check the wire Check the power supply to the remote controller terminal. (DC 19 V or higher) If there is a problem in power supply, check the output voltage of the PCB, and take the action separately for wiring error and defective PCB, respectively. If the power supply is normal, replace the remote controller. ©Navien America Inc. 2010 127 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
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4.6.10. Manifold PABCR180AMF_001 Na
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4.6.12. GPS Navien Part No. Functio
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4.6.14. Water Adjustment Valve Navi
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4.6.16. Primary Heat Exchanger Navi
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4.6.18. Buffer Tank (“A” Series
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4.6.20. Bypass Mixing Valve (“Non
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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
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 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
Page 154 and 155: 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
Page 160 and 161: NO Description Navien Part No. Rema
Page 164 and 165: 9.3. Water Way Disassemble (NR-A)
Page 166 and 167: 9.5. Water Way Disassemble (NP-A)
Page 172 and 173: 10.2. Inspection Report Inspection
Page 174 and 175: Memo ©Navien America Inc. 2010 172
Page 176 and 177: Memo ©Navien America Inc. 2010 174
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Memo ©Navien America Inc. 2010 176
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Navien NP Condensing Tankless Gas Water Heater - Service Manual

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