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Navien Manuals
Water Heater
NR Series
Service manual
Navien NR Series Service Manual
Tankless water heaters
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Specifications
Exterior View
Interior View and List of Main Components
Schematic and Water Flow Diagram
Operation
Firing Sequence
Shut-Down Sequence
Standby Mode
Replaceable Major Components
Primary Heat Exchanger
Secondary (Condensing) Heat Exchanger
Fan
Pump
Gas Valve
Water Adjustment Valve
Buffer Tank
Gas Pressure Sensor (GPS)
Air Pressure Sensor (APS)
Flow Sensor
High Limit Switch or Exhaust Limit Switch
Thermostat
Ignition Transformer
Transformer
Thermal Fuse
Burner
Manifold
PCB Board
Bypass Mixing Valve
Igniter
Wiring Diagram
PCB Board Check Points for Diagnosis
Operational Flow Chart
Abbreviation and Definition
Error Code and Troubleshooting
Power Supply Troubleshooting
Boiling Inside Heat Exchanger
Ignition Failure
False Flame Deflection
Outlet Thermostat Open
Outlet Thermostat Short
Fan Motor RPM Error
Air Pressure Sensor Error
Flame Loss
Cold Water Inlet Thermostat Open/Short
Water High Limit/Overheat Cut-Off Fuse Error
Exhaust High Limit Error
Abnormal Air Pressure Sensor
Abnormal Water Adjustment Valve
Abnormal Gas Pressure Sensor
Leak Detect
Abnormal Circulation Pump
Abnormal the Water Flow Sensor
Abnormal LPG Gas Pressure
Communication Error with PCB Board
Communication Failure
Outlet Thermistor 2 Open/Short
Cascade Connection Abnormal
Thermostats Connection Abnormal
Anbormal Mixing Valve
Disassemble, Replace and Repair
Fan (Combustion Air Blow)
Fuse
Igniter Removal
Ignition Transformer Removal
Air Pressure Sensor (APS) Removal
PCB Board Removal
Gas Pressure Sensor (GPS) (Disassembly and Assembly)
Condensation Trap
Buffer Tank (Disassembly and Assembly)
Pump (Disassembly and Assembly)
Transformer (Disassembly and Assembly)
3-Way Valve
Water Adjustment Valve (Disassembly and Assembly)
Flow Sensor (Disassembly and Assembly)
2-Way Valve
Bypass Mixing Valve (Disassembly and Assembly)
Exploded Views and Parts Lists
Measuring Gas Pressure Setting
Procedure for Measuring the Inlet Gas Pressure
Measuring the Gas-Air Pressure Differential Pressure Setting
Standard Setting Chart of the Gas-Air Pressure
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Quick Links
1
Interior View and List of Main Components
2
Operation
3
Thermostat
4
Error Code and Troubleshooting
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Table of Contents
Troubleshooting
Error Code and Troubleshooting
50
Power Supply Troubleshooting
52
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