Error Codes - Navien NCB700-42C 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
Combustion E016
E030
E046
E047
E060
E109
Air Circulation E110
E127
E205
Central Heating
E218
Circulation
E291
E302
Water Supply E352
E353
E407
E421
E434
DHW Circulation
E441
E445
E480
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 "10.5 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
Abnormal operation: Heat exchanger overheating sensor
Abnormal operation: Exhaust thermostat
Abnormal operation: Dual venturi limit switch
Abnormal operation: Fan
Exhaust blockage (Condensate blockage)
Abnormal operation: APS
Heating supply thermistor open or short circuit
Heating return thermistor open or short circuit
Supply/Return inversion limit
Low water pressure
High water pressure
Abnormal operation: Water pressure sensor
DHW Outlet thermistor Open or Short Circuit
DHW Inlet thermistor Open or Short Circuit
Abnormal operation: Flow control value
DHW Outlet 2 thermistor open or short circuit
Abnormal operation: Mixing valve
DHW tank 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
Auto
Manual/Auto
Alarm
Manual
Manual
Auto/Manual
Auto
Alarm
Manual Reset
Auto
Auto
Auto
Alarm
Auto
Alarm
Alarm
Alarm
Alarm
Manual
Manual
Alarm/Manual
Alarm
Manual
Auto
Auto
Auto
Manual/Power Reset
Manual
Operating the Boiler 53