Navien Error Codes

Tankless Systems are complicated systems and this they can have some errors and electronic issues. We have put together a thorough list of Navien error codes to help you diagnose and potentially fix any issues you may have.

 

CODE ERROR QUICK TROUBLESHOOTING FULL FLASH SOLUTIONS MOBILE PHONE SOLUTION
E001 Water is boiling in the Heat Exchanger 1. clean the inlet water straining

2. Check the automatic flow

3. Check the heat exchanger, remove and clean with a solution

001E
OR
Power Supply
001E
OR
Power Supply
E002 Low Water Pressure 1. Wait until water supplement is terminated.  Reset Is Automatic Reset Is Automatic
E003 Ignition Failure 1. Check to see if the main gas supply is on

2. Check that the power is on

3. Check the igniter for spark

Scenario 1
Scenario 2
Scenario 3
Scenario 1
Scenario 1
Scenario 1
E004 False flame detection 1. Ensure ground wire is connected

2. Check the igniter for spark

004E 004E
E007 Hot water outlet: thermistor -open 1. Check the thermistor

2. Replace the thermistor

007E 007E
E008 Hot water outlet: thermistor -short 1. Check the thermistor

2. Replace the thermistor

008E 008E
E009 Abnormal fan motor activity 1. Check and clean the air filter

2. Check and clean the fan motor

009E 009E
E010 Abnormal Air Pressure 1. Check the vent pipe for obstructions

2. Check and clean the air filter

010E 010E
E011 High Water Pressure 1. Check the water pressure sensor. Automatic Reset Automatic Reset
E012 Flame loss 1. Check the main gas line (valve open?)

2. Check intake air pipe

3. Check the ground wire

4. Check power supply

012E 012E
E015 Abnormal control board 1. Check power supply

2. Check the GFI

Not Defined Not Defined
E016 Overheating of heat exchanger 1. Turn off the the for at least 30 minutes ten restart.

2. Clean the inlet water strainer

3. Check the automatic flow adjustment valve

4. Check the heat exchanger: remove and clean with a cleaning solution

016E 016E
E021 Cold water inlet: thermistor 1 -open 1. Check thermistor

2. Replace thermistor

021E 021E
E022 Cold water inlet: thermistor 1 -short 1. Check thermistor

2. Replace thermistor

022E 022E
E027 Abnormal activity of the air pressure sensor 1. Check the vent pipe for obstructions

2. Check and clean the air filter

027E 027E
E028 Water leak pipe line 1. Check pipe line. Reset – Manual Reset – Manual
E030 Exhaust overheat: exhaust high limit switch shuts down the unit when the flue temperature exceeds 149 F or 65C 1. Turn off the the for at least 30 minutes ten restart.

2. Clean the inlet water strainer

3. Check the automatic flow adjustment valve

4. Check the heat exchanger: remove and clean with a cleaning solution

030E 030E
E032 Cold water inlet: thermistor 2 -open 1. Check thermistor

2. Replace thermistor

032E 032E
E033 Cold water inlet: thermistor 2 -short 1. Check thermistor

2. Replace thermistor

033E 033E
E034 Abnormal – flow adjustment valve 1. Check the flow adjustment valve Not Defined Not Defined
E035 Abnormal activity of the gas pressure sensor 1. Check gas line 035E 035E
E036 Communication failure 1. Contact Navien Tech. support Not Defined Not Defined
E037 Water leak inside unit 1. Close cold water main

2. Replace leaking parts

037E 037E
E038 Abnormal circulation pump 1. Check the circulation PUMP.

2. Check the water flow sensor

3. Check the cold water main

Not Defined Not Defined
E039 Abnormal – water flow sensor 1. Check the water flow sensor Not Defined Not Defined
E041 Hot water outlet: thermistor 2 -open 1. Check thermistor
2. Replace thermistor
Not Defined Not Defined
E042 Hot water outlet: thermistor 2 -short 1. Check thermistor
2. Replace thermistor
Not Defined Not Defined
E043 Abnormal cascade connection 1. Check model type Not Defined Not Defined
E044 Abnormal thermistor connection 1. Check thermistor connection Not Defined Not Defined
E045 Abnormal – mixing valve 1. Check the mixing valve Not Defined Not Defined
E048 Abnormal LPG gas pressure 1. Check the LPG gas
2. Fill the LPG gas
Not Defined Not Defined