Error Code List - Navien NCB-180 Service Manual

5.2 Error Code List

Error Code
Ignition failure
E003
False flame detection
E004
Flame loss
E012
Overheating of heat exchanger
E016
Exhaust Overheat: exhaust limit switch
shuts down the unit when the flue
E030
temperature exceeds 230 °F (110 °C) for more
than 10 minutes.
Abnormal heat exchanger thermistor
E046
Abnormal exhaust thermistor
E047
Abnormal operation: dual venturi
E060
Abnormal fan motor activity
E109
Exhaust blockage
E110
Heating supply : thermistor open or short
E205
Heating return : thermistor open or short
E218
78 NCB Service Manual
Function Self-diagnostic/Action
1. Check to see if the main gas supply valve is open.
2. Check that the power is "ON".
3. Check the igniter for spark.
4. Tighten the ground connection screws on heat exchanger.
1. Ensure ground wire is connected.
2. Check the igniter for spark.
1. Check the main gas line (Is the valve open?).
2. Check intake air filter.
3. Check ground wire.
4. Check power supply.
5. Tighten the ground connection screws on heat exchanger.
1. Turn OFF the system for at least 30 minutes then restart.
2. Clean the inlet water filter.
3. Check the high limit switch
4. Check the water adjustment valve.
5. Check the heat exchanger; a flush may be necessary.
1. Turn OFF the system for at least 30 minutes then restart.
2. Clean the inlet water filter.
3. Check the water adjustment valve.
4. Check the heat exchanger; a flush may be necessary.
Check heat exchanger thermistor connection
Check exhaust thermistor connection.
Check the Dual Venturi connection.
1. Check and clean the intake air filter.
2. Check and clean the fan motor.
1. Check the exhaust pipe for obstructions.
2. Check and clean the intake air filter
1. Check the thermistor.
2. Check the pump connection and 고착
Check the thermistor.
Version 1.0