Error Code Guide - Navien NR-20DU Manual

Error Code Guide

Error Code
E003 Ignition failure
E004 False flame detection
E012 Flame loss
E016 Overheating of heat exchanger
E030 Exhaust overheating (the water
heater shuts down when the flue
temperature exceeds 149°F (65°C)
E046 Abnormal operation: limit control Contact Technical Support at 0844-332-2323
E047 Abnormal operation: exhaust
thermostat
Reason Self-diagnostic / Action
Ensure that the main gas supply valve is open.
Ensure that the electrical cord is properly grounded.
Clean the intake air filter. See the Operation manual.
Ensure that the electrical cord is properly grounded.
Turn off the system for at least 30 minutes, and then
restart it.
Clean the cold water inlet filter. See the Operation
manual.
Flush the heat exchanger. See the Operation manual.
Turn off the system for at least 30 minutes, and then
restart it.
Clean the cold water inlet filter. See the Operation
manual.
Flush the heat exchanger. See the Operation manual.
Contact Technical Support at 0844-332-2323