Troubleshooting; Error Code Classification - Navien NHB-055 Service Manual

5. Troubleshooting

5.1 Error code classification

Classification
Combustion System
Air supply System
CH System
Water supply System
Controller
Installation System
78 NHB Service Manual
Error Code Error Level
3
E001
2
E003 3
E004 2
E012 3
E016 3
3
E030
1
E046 2
3
E047
2
E060 1
E109 3
E110 3
- -
E205 2
E218 1
E271 1
E278 1
E279 1
E291 3
E302 3
E352 2
E353 2
E515 3
E517 3
E594 1
E615 3
E740 1
E777 2
E782 1
E784 1
Function
Overheating of Heat Exchanger
Ignition failure
False flame detection
Flame loss
Overheating of heat exchanger
Exhaust Overheat: exhaust limit switch shuts
down the unit when the flue temperature
exceeds 230°F(110°C) for more than 10
seconds.
Abnormal heat exchanger thermistor
Abnormal exhaust thermistor
Abnormal Dual Venturi Limit Switch
Abnormal FAN motor activity
Exhaust blockage
Abnormal APS (open, short, initial value or no
answer)
Abnormal H / E outlet : thermistor open or
short
Abnormal H / E inlet : thermistor open or short
Temperature differential limit
Abnormal system supply thermistor
Abnormal system return thermistor
Supply / Return inversion limit
Abnormal water pressure (Low pressure)
Abnormal water pressure (High pressure)
Abnormal water pressure sensor
Abnormal PCB
Abnormal DIP Switch setting
Abnormal communication in parts of PCB
Abnormal input & memory
Abnormal outdoor sensor
Abnormal LWCO
Abnormal Main-Panel communication
Abnormal Zone controller communication
Self-diagnostic / Action
Manual RESET
Auto RESET
Manual RESET
Auto RESET
Manual RESET
Manual RESET
Manual RESET
Alarm
Auto RESET
Manual RESET
Auto RESET
Auto RESET
Manual RESET
Manual RESET
No error display
Auto RESET
Alarm
Alarm
Alarm
Alarm
Manual RESET
Manual RESET
Auto Reset
Auto Reset
Manual RESET
Manual RESET
Alarm
Manual RESET
Alarm
Auto RESET
Alarm
Alarm
Version 1.0