Understanding Error Codes - Navien NCB-190/060H Installation & Operation Manual

11.7 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
E001 Heatexchanger over temperature
E003 Ignition failure
E004 False flame detection
E012 Flame loss
E016 Overheating of heat exchanger
E030 Abnormal exhaust temperature
E031 Overheating of burner
E046 Abnormal operation: limit control
E047 Abnormal operation: exhaust thermostat
E060 Abnormal operation: dual venturi
E109 Abnormal operation: fan motor
E110 Abnormal air pressure
Heating supply thermistor open or short
E205
circuit
Heating return thermistor open or short
E218
circuit
Abnormal operation: system supply
E278
thermistor
Abnormal operation: system return
E279
thermistor
Abnormal Auto feeder valve (make-up
E351
water)
E352 High water pressure
E353 Abnormal operation: water pressure sensor
Domestic hot: thermistor open or short
E407
circuit
Domestic cold: thermistor open or short
E421
circuit
Self-Diagnostic/ Action
Reset the boiler from the front panel.
Ensure that the main gas supply valve is open.
Ensure that the electrical cord is properly grounded.
Clean the intake air filter.
●
Ensure that the electrical cord is properly
●
grounded.
Turn off the system for at least 30 minutes, and
●
then restart it.
Flush the heat exchanger.
●
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 technical support at 1-800-519-8794.
Clean the intake air filter.
Ensure that the exhaust pipe is free of
●
obstructions.
Clean the intake air filter.
●
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 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 technical support at 1-800-519-8794.
Operating the Boiler 121