Understanding Error Codes - Navien NPE-180A Operation Manual

5.2 Understanding Error Codes

When an error code appears on the front panel, refer to the following chart for a definition and possible remedy for the situation.
Error Code Reason
E003 Ignition failure
E004 False flame detection
E012 Flame loss
E016 Overheating of heat exchanger
Exhaust overheating (the water heater shuts
E030 down when the flue temperature exceeds
149°F (65°C)
E046 Abnormal operation: limit control
E047 Abnormal operation: exhaust thermostat
E060 Abnormal operation: dual venturi
E109 Abnormal operation: fan motor
E110 Abnormal air pressure
Hot water outlet: thermistor open or short
E407
circuit
Cold water inlet1: thermistor open or short
E421
circuit
Cold water inlet2: thermistor open or short
E432
circuit
E434 Abnormal operation: water adjustment valve
E438 Abnormal operation: circulation pump
E439 Abnormal operation: flow sensor
Hot water inlet2: thermistor open or short
E441
circuit
E445 Abnormal operation: Bypass mixing valve
E515 Abnormal operation: PCB
E517 Abnormal operation: DIP switch setting
E593 Abnormal operation: front panel key
E615 Abnormal operation: input and memory
E736 Abnormal operation: cascade communication
E760 Flushing/service alarm
Abnormal operation: main panel
E782
communication
If any of these remedies do not resolve the problem, contact Technical Support at 1-800-519-8794.
16 Troubleshooting
Self-diagnostic / Action
Ensure that the main gas supply valve is open.
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Ensure that the electrical cord is properly grounded.
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Clean the intake air filter. See page
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Ensure that the electrical cord is properly grounded.
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Turn off the system for at least 30 minutes, and then restart it.
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Clean the cold water inlet filter. See page
●
Flush the heat exchanger. See page
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Turn off the system for at least 30 minutes, and then restart it.
●
Clean the cold water inlet filter. See page
●
Flush the heat exchanger. See page
●
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
Clean the intake air filter. See page 13.
Ensure that the exhaust pipe is free of obstructions.
●
Clean the intake air filter. See page
●
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
External: Ensure that all water supply and return lines are open.
●
Internal: Check the direction of the 2-way valve.
●
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
Ensure that the electrical cord is properly grounded.
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
Contact Technical Support at 1-800-519-8794.
Contact the installer to perform routine service.
Contact Technical Support at 1-800-519-8794.
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