Fix for all Navien Error Codes [Navin Tankless Water Heater]

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Navien Error Codes: Finding a troublesome error code on your Navien tankless water heater can be frustrating, particularly when you rely on hot showers. Jump right in, because in this guide, by the end of the day, you will know how to tackle error codes like a professional. We’ve compiled the most common Navien error codes, along with detailed descriptions and well-detailed procedures to resolve them. So put on your detective hat, grab your tools, and let’s get to work to get your hot water flowing again!

The purpose of this guide is to assist users with some error codes that appear on Navien water heaters and boilers. If an error is not included here, or the problem persists after taking the above steps, seek help from a certified Navien technician.

Navien Error Codes Fix

Fixing Navien Error Code E001

Navien Error Codes

Navien Error Code E002 Fix

  • Reason: The water pressure is below normal. In most situations, the reason why this happens is there is not enough water supplied to the unit.

  • Self-Diagnostics/Action:

    • Take a few moments to check the water supply for your house or building. Make sure the main valve is opened fully and there is no disruption or leakage on the supply line.
    • Your unit’s internal components may be damaged if your water supply is normal. For further diagnosis, please contact a Navien technician.

  • Automation: The unit will clear this error by itself, provided the water pressure has been restored to the required level.

Navien Error Code E003 Fix

  • Reason: Failure to ignite. Closed main gas supply valve or an appropriate igniter may also cause the failure.

  • Self-Diagnosis/Action:

    • Open the main gas supply valve.
    • If the valve is already open, then the igniter is faulty. Call a Navien technician to replace it.

  • Automation: This error can only be solved by manually controlling it.

Navien Error Code E004 Fix

  • Reason: Flame detection failure. Closed main gas supply valves, bad ignitors, or flame sensors can supply the sensor with closed-loop feedback causing failure.

  • Self-Diagnostics/Action:

    • Open the main gas supply valve.
    • If the valve is open, the igniter or flame sensor is faulty. Call a Navien technician to carry out the necessary diagnostic repair.

  • Automation: While the unit can eliminate the error itself, should the encumbering cause still be present, manual intervention will need to take place.

Navien Error Code E005 Fix

  • Reason: Heating supply outlet: Thermistor – open. This is associated with a fault in the thermistor that senses the heating supply outlet temperature.

  • Self-Diagnostics/Action:

    • Make sure that the ground wire is attached to the unit properly.
    • If the ground wire is attached properly, there is a possibility that the thermistor is defective. Arrange for a Navien technician to perform the necessary replacement.

  • Automation: The unit attempts to correct this error automatically, but he has to manually intervene if the thermistor is the problem.

Navien Error Code E006 Fix

  • Reason: Heating supply outlet: Thermistor – short. This is associated with a short-circuit fault in the thermistor that measures the heating supply outlet temperature.

  • Self-Diagnostics/Action:

    • Examine the thermistor and its associated wiring for damage or loose connections.
    • If some damage is noted, make arrangements with a Navien technician to affect the required repair or replacement.

  • Automation: The unit attempts to correct this error autonomously but will require manual intervention if the thermistor is the issue.

Navien Error Code E007 Fix

  • Reason: Hot water outlet: Thermistor – open. This is associated with a fault in the thermistor that senses the hot water outlet temperature.

  • Self-Diagnostics/Action:

    • Check for any damage to the wiring of the thermistor and any loose connections to it.
    • When you note such problems, make arrangements with a Navien technician to affect the required repair or replacement.

  • Automation: If the unit’s error system has been engaged, it will try to resolve the issue automatically, but in cases where the thermistor is damaged, manual work will be needed.

Navien Error Code E008 Fix

  • Reason: Hot water outlet: Thermistor – short. This means that there is a short circuit where the thermistor is that measures the temperature of the hot water outlet.

  • Self-Diagnostics/Action:

    • Perform a visual inspection of the thermistor and its associated leads for broken wires, poor connections, and/or any water damage.
    • Where any of the above is obtained, a Navien technician should be called for his/her assistance.

  • Automation: The system will make an attempt to correct the error, but in the case where a thermistor is faulty, manual work will be needed.

Navien Error Code E009 Fix

  • Reason: Fan motor activity is excessive. This could be due to an obstructed filter, a defective fan motor, or perhaps there’s a loose plug at the terminal of the control board.

  • Self-Diagnostics/Action:

    • Switch off the appliance and let it stand for a while to cool down.
    • Find and clean the air filter. It is normally positioned in front of the fan.
    • In situations where the air filter is not the issue, then the fan motor requires further examination. A Navien technician should be contacted for maintenance or service.

  • Automation: Manual action is needed for this error.

Fixing Error Code E010 for Navien

  • Cause: Unusual air pressure. This may be due to an obstruction in the vent or fresh air pipe, excess dirt in the filter, or issues with the aircondensate drain.

  • Self Diagnostics/Actions:

    • Look for blockades, like bird nests, in the vent and fresh air pipes.
    • Replace the air filter as needed.
    • Examine the condensate drain line for obstructions and proper slopes.

  • Automation: Automatic diagnosis does not fix this problem, human manual intervention is needed.

Fixing Error Code E011 for Navien

  • Cause: Excessive water pressure. This is typically a result of too much water pressure present in the supply line.

  • Self Diagonostics/Actions:

    • Test the water pressure using a pressure gauge. If the pressure is higher than the recommended range (approximately 45 to 80psi), a pressure reducing valve may need to be fitted to the mainline.
    • Should the water pressure seem normal, the unit’s pressure sensor is likely faulty and must be serviced by a Navien technician.

  • Automation: The unit can attempt autonomous adjustment regulation of water pressure, but if the issue continues, human intervention will need to take place.

Navien E012 Error Code Solution

  • Problem: Flame failure. This may happen because the gas line is closed, the intake air pipe is blocked, the ground wire is faulty, there is a power supply problem, or the flame rod is dirty.

  • Self-Diagnostics/Action:

    1. Confirm that the main gas line valve is in the open position.
    2. Inspect the intake air pipe for any obstructions.
    3. Make sure the ground wire is connected properly.
    4. Check if there is power supplied to the unit.
    5. If the flame rod is dirty, clean it using a soft cloth.

  • Automation: This error must be resolved manually.

Navien E013 Error Code Solution

  • Problem: Abnormal activity of the pump. This may be due to a malfunctioning pump or the presence of air in the heating system pipes.

  • Self-Diagnostics/Action:

    1. If you notice strange sounds coming from the pump or it is not circulating water properly, it may be damaged. You should call a Navien specialist to replace it.
    2. If air is present in the pipes, you may need to purge the system. This should preferably be done by a qualified technician.

  • Automation: This error is often resolved with manual intervention.

Navien E015 Error Code Solution

  • Problem: Abnormal behavior of the control board. This is always attributed to a power supply fault or an issue with the control board.

  • Self-Diagnostics/Action:

    • Check that the power supply to the unit is properly connected. If there was a power outage or tripped circuit, restore normal operation. If the power supply is normal, there is a possible defect on the control board. Call Navien service technician for replacement.

  • Automation: This error needs to be handled manually.

Navien Error Code E016 Fix

  • Reason: Heating exchanger overheating caused by a clogged inlet water filter, malfunctioning heat exchanger, or insufficient water flow are the main causes.

  • Self-Diagnostics/Action:

    • A 30-minute cool-down period will suffice. Switch off the unit and allow it to cool down for 30 minutes. Inlet water filter needs cleaning. If the unit has not worked properly after filter cleaning, the heat exchanger may need to be flushed. If the heat exchanger has not been cleaned, it’s best to reach out to a Navien technician.

  • Automation: This error requires manual resolution.

Navien Error Code E018 Fix

  • Reason: Thermistor-open at the heating return inlet is faulty. This means that the component which observes the temperature of the heating return inlet is malfunctioning.

  • Self-Diagnostics/Action:

    • Look over the thermistor along with the wiring harness for signs of damage and check for tightness of the connections. For any issues, reach out to a Navien technician for fixtures.

  • Automation: This unit feature attempts to resolve the above error autonomously, however in the event the thermistor is damaged, manual assistance will be needed.

Navien Error Code E019 Fix

  • Reason: Short in the heating return inlet thermistor. This error means that the thermistor, which checks the temperature of the heating return inlet, has developed a short circuit.

  • Automation: This unit attempts to self rectify the fault code, however, in the event that the thermistor prefab fails, manual support will be required. The unit will attempt to self rectify any errors. In the vent this error pivots on an open thermistor, manual rectification will be needed.

Navien Error Code E021 Fix

  • Reason: Cold water inlet: Thermistor–open. This identifies the issue with the cold water inlet thermistor.

  • Self-diagnostics/action:

    • Inspect the water inlet thermistor and the wiring around it. If issues are located, consult with a Navien technician for replacement or necessary repairs.

  • Automation: The unit will attempt to resolve this issue autonomously, however, in the event the thermistor is faulty, manual intervention will be required.

Navien Error Code E022 Fix

  • Reason: Thermistor cold water inlet –short. Analysis: Cold water inlet thermistor has developed a short circuit.

  • Self-Diagnostics/Action:

    • Investigate the thermistor and surrounding wiring to ensure that there are no damages, loose connections, or signs of water leakage.
    • For any identified problems, reach out to a Navien technician for either repair or replacement.

  • Automation: The unit will initiate self-repair, however, manual action will be required for any faults with the thermistor, you can get help from the navien app too.

Navien Error Code E027 Fix

  • Reason: Abnormal error in the activity of the air pressure sensor. Unusual sensor activity can stem from blockage in the vent pipe, or even a clogged air filter.

  • Self-Diagnostics/Action:

    • Examine the vent pipe for obstructions.
    • Confirm the cleanliness of the air filter.

  • Automation: The unit will take measures to remove the error, however, if the root problem is still present, the unit will require manual assistance.

Navien Error Code E028 Fix

  • Reason: Leakage from the water pipeline.

  • Self-Diagnostics/Action:

    • Thoroughly check all water pipes that interface with the unit for any leaks or damages.
    • If any leaks are discovered, either repair them or reach out to a certified plumber for help.

  • Automation: Manual intervention is required to address this error.

Navien Error Code E030 Fix

  • Reason: Exhaust Overheat. The flue high limit shut-off switch disables the unit when the exhaust temperature is more than 149 degrees Fahrenheit (65 degrees Celsius). This may be due to the inlet water filter being dirty, a defect in the heat exchanger, or even a choked-up vent pipe.

  • Self-Diagnostics/Action:

    • Change the inlet water filter.
    • Check the vent pipe for blockages.
    • If the filter is clean and the vent pipe is clear, the heat exchanger may be faulty. Contact a Navien technician for assistance.

  • Automation: The automated response to this error is to stop the unit completely to stop overheating. If an underlying problem still exists, the operator will need to solve it manually.

Navien Error Code E035 Fix

  • Reason: Gas pressure sensor abnormal activity. Possible reasons include: drop of gas pressure, loose hose connection, or anything that may defect the gas pressure sensor (GPS).

  • Self-Diagnostics/Action:

    • Measure the gas pressure with a manometer. If it’s below the intended range, phone your gas provider.
    • Review the gas hose connection for any blockage or leaks.
    • If the gas pressure and hose connection are normal, assume the GPS is defective. Phone Navien technician to replace.

  • Automation: Intervention from a human is needed to correct this error.

Navien Error Code E036 Fix

  • Reason: Communication Failure. This means the control board is having difficulty communicating with other parts of the unit.

  • Self-Diagnostics/Action:

    • Try power cycling the unit. Shut it down and restart it.
    • If the issue does not resolve, contact Navien’s support. They may be able to assist you directly or determine if a service visit is required to fix the problem.

  • Automation: The unit will try to communicate on its own, but if it is unsuccessful, then user input will be required to fix the issue.

Navien Error Code E039 Fix

  • Reason: Water Flow Sensor signal is either too high or too low. This can happen if the water flow sensor is damaged or if there is not enough water flowing to the unit.

  • Self-Diagnostics/Action:

    • Check water flow sensor for possible malfunction. If the water flow is incorrectly detected, the sensor might require replacement.
    • Make sure that the water flow into the unit is sufficient. Inspect the inlet water filter, along with the water supply line, to ensure there are no obstructions.

  • Automation: Usually, this error will require someone to manually resolve it.

Navien Error Code E040 Fix

  • Reason: Outdoor. Short of thermistor. This indicates that the outdoor thermistor, which measures the outside air temperature, has a short circuit.

  • Self Diaognostic / Action:

    • Examine the thermistor and connections for physical damage or loose wiring. If found, contact a Navien technician for the necessary repair or recombination.

  • Automation: A manual action is required to eliminate this malfunction.

Navien Error Code E048 Fix

  • Reason: Abnormal Gas Pressure of LPG. It could be as a result of lower LPG gas pressure or a drained LPG tank.

  • Self Diagnostic / Action:

    • Investigate the level of LPG gas pressure. If it is low, contact your LPG supplier to have the tank refilled. If the gas pressure is acceptable, then the issue could be with the gas regulator or the gas line. This should be remedied by a professional technician.

  • Automation: A manual action is required to eliminate this malfunction.

Also Read: Navien e439 Error Code

Navien Error Codes

All errors are given in Tabular form:

Error Code Reason Self-Diagnostics/Action Automation
Navien Error Code E001 Water is boiling inside the heat exchanger Clean the inlet water filter. Check the heat exchanger; flush it with a cleaning solution. Manual
Navien Error Code E002 Low water pressure Wait until the water supplement is terminated. Automatic
Navien Error Code E003 Ignition failure Check if the main gas supply valve is open. Check the igniter for spark. Manual
Navien Error Code E004 False flame detection Check if the main gas supply valve is open. Check the igniter for spark. Automatic
Navien Error Code E005 Heating supply outlet: Thermistor–open Ensure the ground wire is connected. Check the igniter for spark. Automatic
Navien Error Code E006 Heating supply outlet: Thermistor–short Check the thermistor. Check for loose connections. Replace the thermistor. Automatic
Navien Error Code E007 Hot water outlet: Thermistor–open Check the thermistor. Check for loose connections. Replace the thermistor. Automatic
Navien Error Code E008 Hot water outlet: Thermistor–short Check the thermistor. Look for short or water in connection. Replace the thermistor. Automatic
Navien Error Code E009 Abnormal fan motor activity Check and clean the air filter. Check and clean the fan motor. Check the tower on board for loose connection. Manual
Navien Error Code E010 Abnormal air pressure Check the vent and fresh air pipe for obstructions. Check and clean the air filter. Check hoses and condensate drain. Manual
Navien Error Code E011 High water pressure Check the water pressure sensor. Automatic
Navien Error Code E012 Flame loss Check the main gas line (valve open?). Check the intake air pipe. Check ground wire. Check power supply. Clean flame rod. Manual
ENavien Error Code 013 Abnormal pump Check the pump. Remove air from the pipe. Manual
Navien Error Code E015 Abnormal control board Check power supply. Check the Emergency Switch. Manual
Navien Error Code E016 Overheating of heat exchanger Turn OFF the system for at least 30 minutes then restart. Clean the inlet water filter. Check the heat exchanger; flush with a cleaning solution. Manual
Navien Error Code E018 Heating return inlet: Thermistor–open Check the thermistor. Check for loose connection. Replace the thermistor. Automatic
Navien Error Code E019 Heating return inlet: Thermistor–short Check the thermistor. Check for short or water in connection. Replace the thermistor. Automatic
Navien Error Code E021 Cold water inlet: Thermistor–open Check the thermistor. Check for loose connection. Replace the thermistor. Automatic
Navien Error Code E022 Cold water inlet: Thermistor–short Check the thermistor. Check for short or water in connection. Replace the thermistor. Automatic
Navien Error Code E027 Abnormal activity of the air pressure sensor Check the vent pipe for obstructions. Check and clean the air filter. Automatic
Navien Error Code E028 Water leak pipeline Check pipeline. Manual
Navien Error Code E030 Exhaust Overheat: exhaust high limit the switch shuts down the unit when the flue temperature exceeds 149°F (65°C) Clean the inlet water filter. Check the heat exchanger; flush it with a cleaning solution. Automatic
Navien Error Code E035 Abnormal activity of the gas pressure sensor Measure gas pressure drop. Check hose connection. Replace GPS. Manual
Navien Error Code E036 Communication failure Contact Navien tech. dept. Automatic
Navien Error Code E039 Abnormal the Water Flow Sensor Check the water flow sensor. Manual
Navien Error Code E040 Outdoor: Thermistor–short Check the thermistor. Replace the thermistor. Manual
Navien Error Code E048 Abnormal LPG Gas Pressure Check the LPG Gas. Fill the LPG Gas. Manual

Final Thoughts

Most models of Navien water heaters and boilers come with a self-diagnostic system that helps users with potential issues. Following these steps, addressing and understanding the Navien error codes incorporated in this guide, people can solve small issues by themselves. For more complex problems, it’s recommended to reach out to the Navien technician aide.

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