Navien NPE-180A, Operation Manual

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16 Troubleshooting
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 Self-diagnostic / Action
E003 Ignition failure Ensure that the main gas supply valve is open.
●
E004 False flame detection Ensure that the electrical cord is properly grounded.
●
E012 Flame loss
Clean the intake air filter. See page
●
13.
Ensure that the electrical cord is properly grounded.
●
E016 Overheating of heat exchanger
Turn off the system for at least 30 minutes, and then restart it.
●
Clean the cold water inlet filter. See page
●
12.
Flush the heat exchanger. See page
●
11.
E030
Exhaust overheating (the water heater shuts
down when the flue temperature exceeds
149°F (65°C)
Turn off the system for at least 30 minutes, and then restart it.
●
Clean the cold water inlet filter. See page
●
12.
Flush the heat exchanger. See page
●
11.
E046 Abnormal operation: limit control Contact Technical Support at 1-800-519-8794.
E047 Abnormal operation: exhaust thermostat Contact Technical Support at 1-800-519-8794.
E060 Abnormal operation: dual venturi Contact Technical Support at 1-800-519-8794.
E109 Abnormal operation: fan motor Clean the intake air filter. See page 13.
E110 Abnormal air pressure
Ensure that the exhaust pipe is free of obstructions.
●
Clean the intake air filter. See page
●
13.
E407
Hot water outlet: thermistor open or short
circuit
Contact Technical Support at 1-800-519-8794.
E421
Cold water inlet1: thermistor open or short
circuit
Contact Technical Support at 1-800-519-8794.
E432
Cold water inlet2: thermistor open or short
circuit
Contact Technical Support at 1-800-519-8794.
E434 Abnormal operation: water adjustment valve Contact Technical Support at 1-800-519-8794.
E438 Abnormal operation: circulation pump
External: Ensure that all water supply and return lines are open.
●
Internal: Check the direction of the 2-way valve.
●
E439 Abnormal operation: flow sensor Contact Technical Support at 1-800-519-8794.
E441
Hot water inlet2: thermistor open or short
circuit
Contact Technical Support at 1-800-519-8794.
E445 Abnormal operation: Bypass mixing valve Contact Technical Support at 1-800-519-8794.
E515 Abnormal operation: PCB Ensure that the electrical cord is properly grounded.
E517 Abnormal operation: DIP switch setting Contact Technical Support at 1-800-519-8794.
E593 Abnormal operation: front panel key Contact Technical Support at 1-800-519-8794.
E615 Abnormal operation: input and memory Contact Technical Support at 1-800-519-8794.
E736 Abnormal operation: cascade communication Contact Technical Support at 1-800-519-8794.
E760 Flushing/service alarm Contact the installer to perform routine service.
E782
Abnormal operation: main panel
communication
Contact Technical Support at 1-800-519-8794.
If any of these remedies do not resolve the problem, contact Technical Support at 1-800-519-8794.