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.

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CODEERRORQUICK TROUBLESHOOTINGFULL FLASH SOLUTIONSMOBILE PHONE SOLUTION
E001Water is boiling in the Heat Exchanger1. 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
E002Low Water Pressure1. Wait until water supplement is terminated. Reset Is AutomaticReset Is Automatic
E003Ignition Failure1. 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
E004False flame detection1. Ensure ground wire is connected

2. Check the igniter for spark

004E004E
E007Hot water outlet: thermistor -open1. Check the thermistor

2. Replace the thermistor

007E007E
E008Hot water outlet: thermistor -short1. Check the thermistor

2. Replace the thermistor

008E008E
E009Abnormal fan motor activity1. Check and clean the air filter

2. Check and clean the fan motor

009E009E
E010Abnormal Air Pressure1. Check the vent pipe for obstructions

2. Check and clean the air filter

010E010E
E011High Water Pressure1. Check the water pressure sensor.Automatic ResetAutomatic Reset
E012Flame loss1. Check the main gas line (valve open?)

2. Check intake air pipe

3. Check the ground wire

4. Check power supply

012E012E
E015Abnormal control board1. Check power supply

2. Check the GFI

Not DefinedNot Defined
E016Overheating of heat exchanger1. 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

016E016E
E021Cold water inlet: thermistor 1 -open1. Check thermistor

2. Replace thermistor

021E021E
E022Cold water inlet: thermistor 1 -short1. Check thermistor

2. Replace thermistor

022E022E
E027Abnormal activity of the air pressure sensor1. Check the vent pipe for obstructions

2. Check and clean the air filter

027E027E
E028Water leak pipe line1. Check pipe line.Reset – ManualReset – Manual
E030Exhaust overheat: exhaust high limit switch shuts down the unit when the flue temperature exceeds 149 F or 65C1. 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

030E030E
E032Cold water inlet: thermistor 2 -open1. Check thermistor

2. Replace thermistor

032E032E
E033Cold water inlet: thermistor 2 -short1. Check thermistor

2. Replace thermistor

033E033E
E034Abnormal – flow adjustment valve1. Check the flow adjustment valveNot DefinedNot Defined
E035Abnormal activity of the gas pressure sensor1. Check gas line035E035E
E036Communication failure1. Contact Navien Tech. supportNot DefinedNot Defined
E037Water leak inside unit1. Close cold water main

2. Replace leaking parts

037E037E
E038Abnormal circulation pump1. Check the circulation PUMP.

2. Check the water flow sensor

3. Check the cold water main

Not DefinedNot Defined
E039Abnormal – water flow sensor1. Check the water flow sensorNot DefinedNot Defined
E041Hot water outlet: thermistor 2 -open1. Check thermistor
2. Replace thermistor
Not DefinedNot Defined
E042Hot water outlet: thermistor 2 -short1. Check thermistor
2. Replace thermistor
Not DefinedNot Defined
E043Abnormal cascade connection1. Check model typeNot DefinedNot Defined
E044Abnormal thermistor connection1. Check thermistor connectionNot DefinedNot Defined
E045Abnormal – mixing valve1. Check the mixing valveNot DefinedNot Defined
E048Abnormal LPG gas pressure1. Check the LPG gas
2. Fill the LPG gas
Not DefinedNot Defined

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