Troubleshooting; Error Code Classification - Navien NCB-180 Service Manual

5. Troubleshooting

5.1 Error code classification

Classification Error Code
E003
E004
E012
E016
Combusition
E030
System
E046
E047
E060
E109
Air supply
E110
System
-
E205
CH
System
E218
-
E351
Water supply
System
E352
E353
E407
DHW
E421
System
E439
E515
E517
Controller
E594
E615
E740
Installation
E782
System
E777
Error Level
3 Ignition failure
2 False flame detection
3 Flame loss
3 Overheating of heat exchanger
Exhaust Overheat: exhaust limit switch shuts down the
3
unit when the flue temperature exceeds 230℉(110℃)
1
for more than 10 seconds.
2 Abnormal heat exchanger thermistor
3
Abnormal exchaust thermistor
2
1 Abnormal Dual Venturi Limit Switch
3 Abnormal FAN motor activity
3 Exhaust blockage
- Abnormal APS (open, short, initial value or no answer)
2 Abnormal H/E outlet : thermistor open or short
1 Abnormal H/E inlet : thermistor open or short
- Abnormal water pressure (Low pressure)
3 Abnormal auto feeder valve
2 Abnormal water pressure (High pressure)
2 Abnormal water pressure sensor
1 Hot water outlet1: thermistor open or short
1 Cold water inlet1: thermistor open or short
3 Abnormal flow sensor
3 Abnormal PCB
3 Abnormal DIP Switch setting
1 Abnormal communication in parts of PCB
3 Abnormal input & memory
2 Abnormal outdoor sensor
1 Abnormal Main-Panel communication
2 Abnormal LWCO
Function Self-diagnostic/Action
Manual RESET
Auto RESET
Manual RESET
Manual RESET
Manual RESET
Auto RESET
Auto RESET
Manual RESET
Auto RESET
Auto RESET
Manual RESET
Manual RESET
No error display
Auto RESET
Alarm
Auto Reset
Manual RESET
Auto Reset
Auto Reset
Alarm
Auto RESET
Auto RESET
Manual RESET
Manual RESET
Alarm
Manual RESET
Auto RESET
Auto RESET
Auto RESET