Error Code List - Navien NCB-150E Service Manual

5.2 Error Code List

Error Code Sub Code
E001 0 Overheating of heat exchanger
E003 0 Ignition failure
E004 0 FALSE flame detection
E012 0 Flame loss
E016 0 Overheating of heat exchanger
Exhaust Overheat: exhaust limit sensor shuts
down the unit when the flue temperature
E030 0
exceeds 230 °F (110 °C) for more than 10
seconds.
E046 2 Abnormal heat exchanger High Limit Switch
1 Abnormal exhaust thermistor (open)
E047
2 Abnormal exhaust thermistor (short)
Abnormal Dual Venturi Limit Switch operation
1
(ON)
Abnormal Dual Venturi Limit Switch operation
E060 2
(Close OFF)
Abnormal Dual Venturi Limit Switch operation
3
(Open ON)
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Self-diagnostic/Action
Clean the Strainer
Check the Pump for proper voltage from PCB(120AC)
Check for proper flow rate and circulation through the
heating line.
Check the heat exchanger; a flush with a cleaning solution.
Tighten the ground connection screws on heat exchanger.
Check to see if the main gas supply valve is open.
Verify that gas pressure is within operating range.
Check gas system and orifice.
Check Dual Venturi for proper operation.
Check for proper dipswitch settings (see page 20)
Ensure ground wire is connected.
Check the igniter for spark.
Tighten the ground connection screws on heat exchanger.
Check the main gas line (Is the valve open?).
Verify gas pressure is within operating range.
Check gas meter for proper BTU capacity.
Check flame rod and verify [K] value in DIAGNOSTIC mode.
Check intake air filter.
Check ground wire.
Check power supply.
Tighten the ground connection screws on heat exchanger.
Clean the inlet water filter and Strainer.
Check High Limit Switch.
Check for proper dipswitch settings (see page 20)
Check the 3 way valve.
Check the heat exchanger; a flush may be necessary.
Turn OFF the system for at least 30 minutes then restart.
Turn OFF the system for at least 30 minutes then restart.
Clean the inlet water filter and Strainer.
Check exhaust thermistor and verify [P] value in
DIAGNOSTIC mode.
Check the heat exchanger; a flush may be necessary.
Check heat exchanger High Limit Switch connection
Check for proper connection to the PCB.
Check exhaust thermistor connection.
Check for proper connection to the PCB.
Check the Dual Venturi connection.
Test Dual Venturi for proper operation using TEST mode.
Check gas orifice for obstructions.
Troubleshooting 83