Navien NCB-150E Service Manual page 85

Error Code Sub Code
E109 0
1
E110 2
3
1
E205
2
1
E218
2
E351 0
E352 1
1
E353
2
1
E407
2
1
E421
2
1-2, 10
3-4
5-7
E515
8
9
11-12
E517 0
E594 0
84 NCB-E Service Manual
Function
Abnormal fan motor activity
Exhaust blockage (checking the FAN)
Exhaust blockage (Using hot water)
Exhaust blockage (using space heating)
Abnormal Heating supply thermistor (Open)
Abnormal Heating supply thermistor (Short)
Abnormal Heating return thermistor (Open)
Abnormal Heating return thermistor (Short)
Abnormal Auto feeder valve (make-up water)
Abnormal Cold water inlet2: thermistor (Open)
Abnormal water pressure sensor (Open)
Abnormal water pressure sensor (Short)
Abnormal Hot water outlet: thermistor (Open)
Abnormal Hot water outlet: thermistor (Open)
Abnormal Cold water inlet: thermistor(Open)
Abnormal Cold water inlet: thermistor(Short)
Abnormal monitoring device of PCB
Abnormal communication between PCB and
Gas V/V
N/A
Abnormal communication between PCB and
Ignitor
Abnormal communication between PCB and
FAN
Abnormal communication between PCB and
Dual Venturi
Abnormal dip switch setting
Abnormal EEPROM of PCB
Self-diagnostic/Action
Check and clean the intake air filter.
●
Verify proper voltage from PCB.
●
Check and clean the fan motor.
●
Check the intake/exhaust/condensate drain pipe for
●
obstructions.(ice, snow, wildlife, etc)
Check and clean the intake air filter
●
As a temporarily solution for troubleshooting purposes,
●
restart the unit and/or remove the front cover.
Check the thermistor. (Connector, Wire, Resistance of
●
sensor)
Check the Pump operation
●
Replace the thermistor.
●
Check the thermistor. (Connector, Wire)
●
Check thermistor voltage from PCB and resistance values.
●
Replace the thermistor.
●
Check the auto feeder valve
●
Check the auto feeder valve
●
Check incoming water pressure and any activity at PRV.
●
Check the water pressure sensor.
●
Check the thermistor. (Connector, Wire, Resistance of
●
sensor)
Check the Pump operation
●
Replace the thermistor. "
●
Check the thermistor. (Connector, Wire)
●
Check thermistor voltage from PCB and resistance values.
●
Replace the thermistor.
●
Check the PCB connection.
●
Reset the PCB power.
●
Check the connection between PCB and Gas V/V
●
Check the Resistance of Gas V/V
●
N/A
Check the PCB connection
●
Check the Ignitor
●
Check the PCB connection
●
Check the Fan
●
Check the PCB connection
●
Check the Dual Venturi
●
Check the dip switches on the front panel and PCB.
●
Check the PCB.
●
Version 1.4