Navien NCB-24LSWE, Service Manual

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78 NCB Service Manual Version 1.0
5. Troubleshooting
5.1 Error Code Classification
Classification
Error
Code
Error Level Function Diagnosis/Actions
Combustion
system
E001
3
2
Heat exchanger overheating Manual reset
E003 3 Ignition error Manual reset
E004 2 False flame detection Auto reset
E012 3 Flame loss Manual reset
E016 3 Heat exchanger overheating Manual reset
E030 3
Exhaust overheat: exhaust limit switch stops the
boiler when the flue temperature exceeds 110
℃
(
230
℉)
for more than 10 sec.
Manual reset
Auto reset
E046 2 Heat exchanger thermistor error Auto reset
E047
3
2
Exhaust thermistor error
Manual reset
Auto reset
E060 2 Dual venturi limit switch error Auto reset
Air supply
system
E109 3 Fan motor activity error Manual reset
E110 3 Exhaust blockage Manual reset
E127
2
3
APS error (open, short, initial value or no response)
Auto reset
Manual reset
CH
system
E205 2 H/E outlet error: thermistor open or short Auto reset
E218 1 H/E inlet error: thermistor open or short Alarm
Water supply
system
E302 2 Low water pressure error Auto reset
E352 2 High water pressure error Auto reset
E353 2 Water pressure sensor error Auto reset
DHW
system
E407 1 Hot water outlet 1: thermistor open or short Alarm
E421 2 Cold water inlet 1: thermistor open or short Auto reset
Controller
E515 3 PCB error Manual reset
E517 3 DIP switch setting error Manual reset
E594 1 Partial PCB communication error Alarm
E615 3 Input and memory error Manual reset
Hardware
E740 2 Outdoor sensor error Auto reset
E782 1 Main panel communication error Auto reset
E783 1 OT-remote controller error Auto reset
E787
2
3
Device reset error Manual reset