Error Codes - Navien NCB300-28K Installation & Operation Manual

10.8 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.
Item Error Code
E001
E003
E004
E012
E016
Combustion
E030
E031
E046
E047
Air Circulation E109
Central Heating
E205
Circulation
Water Supply E302
DHW Circulation E407
E515
E517
Controller (PCB)
E594
E598
Controller (MCU) E615
E740
E782
Installation E783
E787
E788
If the error code is not cleared by resetting the boiler functioning (see "10.4 Resetting the Boiler") or if it occurs repeatedly, call the nearest
official Technical Assistance Service (TAS), indicating the number of the error code appearing on the front panel.
Description
Overheating of heat exchanger
Ignition failure
False flame detection
Flame loss
Heat exchanger overheat
Abnormal exhaust temperature
Burner overheat
Abnormal operation: Heat exchanger overheating sensor
Abnormal operation: Exhaust thermostat
Abnormal operation: Fan
Heating supply thermistor open or short circuit
Low water pressure
DHW Outlet thermistor Open or Short Circuit
Abnormal operation: Relay feedback (PCB)
Abnormal operation: DIP switch setting (PCB)
Abnormal operation: EEPROM (PCB)
Abnormal operation: Panel real time clock
Abnormal operation: Input and memory (MCU)
Abnormal operation: Outdoor temperature sensor
Abnormal operation: Main panel communication
Abnormal operation: OpenTherm remote control
Abnormal operation: Reset device
Abnormal operation: Gas type settings
Reset
Manual
Manual
Auto
Manual
Manual
Manual
Manual
Auto
Manual/Auto
Manual
Auto
Auto
Alarm
Manual
Manual
Alarm/Manual
Alarm
Manual
Auto
Auto
Auto
Manual/Power Reset
Manual
Operating the Boiler 57