Navien Tankless Water Heater error code E110

Navien Tankless Water Heaters are widely appreciated for their high efficiency and dependability. However, as with any appliance, they may sometimes face technical challenges. A common issue reported by users is the error code E110. This particular error code is an indicator of various potential malfunctions affecting the heater’s functionality, often leading to disruptions in hot water supply. This article aims to investigate the root causes of the error code E110 in Navien Tankless Water Heaters and provides a comprehensive guide on troubleshooting and fixing this problem, helping you restore your water heater to its best performance.

Navien Tankless Water Heater error code E110

Reasons behind Navien Tankless Water Heater error code E110

The Navien Tankless Water Heater error code E110 typically indicates:

  1. Overheating: Due to issues in heating elements or heat exchange system, often caused by inadequate water flow or blockages in air intake or exhaust.
  2. Insufficient Water Flow: Poor circulation within the unit, leading to system overheating and triggering the error.
  3. Scale Accumulation: Buildup of minerals from hard water on heating elements, hindering performance.
  4. Air Intake/Exhaust Blockage: Obstructions affecting airflow, resulting in overheating.
  5. Faulty Heat Exchanger: Impairs heat transfer, causing overheating and the error code.

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By acknowledging these critical reasons behind the error code E110 in Navien Tankless Water Heaters, users can approach the rectification process with a foundational understanding of the possible internal disturbances leading to this issue.

How to Fix Navien Tankless Water Heater error code E110?

Fix 1: Addressing Overheating Issues in Navien Tankless Water Heaters

Overheating is a significant factor behind the error code E110 in Navien Tankless Water Heaters, and resolving it is crucial. Here’s a step-by-step guide to address the overheating issues:

  • Step 1: Turn Off the Unit: Before initiating any repairs or inspections, ensure that the water heater is turned off. This is crucial for ensuring safety during the examination and resolution of the issue.
  • Step 2: Inspect Heating Elements: After ensuring the unit is off and it’s safe to proceed, inspect the heating elements for any signs of damage or malfunction. Damaged heating elements can cause overheating and need to be replaced.
  • Step 3: Check Water Flow: Inspect the water flow within the unit to make sure it’s adequate. Clear any blockages and remove any obstructions in the water inlet and outlet to ensure smooth water flow, thus preventing overheating.
  • Step 4: Clean the Air Intake and Exhaust: Examine the air intake and exhaust vents for any blockages. Clean them thoroughly to ensure optimal airflow, preventing the unit from overheating due to insufficient air.
  • Step 5: Examine the Heat Exchanger: Inspect the heat exchanger for any signs of damage or blockage. A malfunctioning heat exchanger can lead to overheating. If any issues are found, it may be necessary to clean or replace the heat exchanger.
  • Step 6: Test the Unit: Once the aforementioned steps are completed, turn on the unit and observe its operation. If the unit is functioning without showing the error code E110, the overheating issue has been resolved.
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Fix 2: Rectifying Insufficient Water Flow

  • Step 1: Turn Off the Unit: Always start by turning off the unit for safety before inspecting for any internal issues or blockages causing insufficient water flow.
  • Step 2: Check Water Filters: Inspect the water filters in the unit. Any clogs or accumulation of debris can restrict water flow, hence, they should be cleaned or replaced as needed.
  • Step 3: Inspect Water Inlet and Outlet: Regularly inspect the water inlet and outlet to ensure they are free from blockages. Clear any obstructions to restore proper water flow within the unit.
  • Step 4: Assess Water Pressure: Low water pressure can also lead to insufficient water flow. Check the water pressure, and if it’s low, it may be necessary to adjust the water pressure to the recommended settings.
  • Step 5: Consult a Professional: If water flow issues persist after addressing the above steps, it’s advisable to seek professional assistance to accurately identify and resolve any underlying problems impacting water flow.

Fix 3: Eliminating Scale Accumulation

Follow steps:

  • Step 1: Turn Off the Unit: Before commencing with descaling, turn off the water heater to prevent any accidents or damage during the cleaning process.
  • Step 2: Prepare a Descaling Solution: Prepare a descaling solution as per the manufacturer’s recommendations or purchase a commercially available descaling agent suitable for tankless water heaters.
  • Step 3: Disconnect Electrical Power: Ensure to disconnect the electrical power to the unit before starting the descaling process to avoid electrical hazards.
  • Step 4: Perform Descaling: Following the manufacturer’s guidelines, circulate the descaling solution through the unit to remove any scale buildup from the heating elements and other internal components.
  • Step 5: Rinse Thoroughly: After descaling, rinse the unit thoroughly with clean water to remove any residual descaling solution.
  • Step 6: Restore Power and Test the Unit: Reconnect the power and test the unit for normal operation. If the error code E110 persists, consult a professional technician for further assistance.

Fix 4: Clearing Air Intake and Exhaust Blockages

  • Step 1: Turn Off the Unit and Disconnect Power: Start by turning off the unit and disconnecting the power. This is a crucial safety step before examining air intake and exhaust passages.
  • Step 2: Inspect Air Intake and Exhaust Vents: Inspect the air intake and exhaust vents for any visible obstructions or blockages and remove them to ensure proper ventilation.
  • Step 3: Clean the Vents: Use a suitable cleaning tool to clean the vents thoroughly, removing any debris or dirt accumulation that could hinder airflow.
  • Step 4: Check Venting Configuration: Review the venting configuration of the unit to ensure it complies with the manufacturer’s specifications. Improper venting can lead to blockages and impair the unit’s performance.
  • Step 5: Test the Unit: After cleaning and ensuring proper venting configuration, test the unit for normal operation. If the error code E110 reappears, seek help from a qualified technician to address any remaining issues.

By addressing these varied issues systematically, users can often resolve the Navien Tankless Water Heater error code E110 and ensure the efficient and reliable operation of their units.

Fix 5: Addressing Faulty Heat Exchanger Issues

Follow steps:

  • Step 1: Power Down the Unit: For safety, shut down the unit and disconnect the power before performing any inspection or repairs on the heat exchanger.
  • Step 2: Inspect the Heat Exchanger: Examine the heat exchanger meticulously for any visible damages, corrosion, or blockages that could impact its functioning.
  • Step 3: Clean the Heat Exchanger: If blockages are detected, clean the heat exchanger thoroughly to remove any obstructions that might be impacting the heat transfer process.
  • Step 4: Replace if Necessary: Should the heat exchanger exhibit signs of damage or corrosion, it may necessitate replacement. Consult the unit’s manual or a professional for guidance on replacement procedures.
  • Step 5: Test the Unit: Once all necessary actions are taken, restart the unit and monitor its operations to see if the error code E110 persists. If so, seeking professional advice is imperative.
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Fix 6: Adjusting Water Pressure

Follow steps:

  • Step 1: Turn Off the Unit: Safety is paramount. Thus, ensure the unit is turned off before attempting to adjust the water pressure.
  • Step 2: Review Manufacturer’s Specifications: Refer to the manufacturer’s specifications in the manual for the recommended water pressure settings for your specific model.
  • Step 3: Adjust the Water Pressure: Use a pressure gauge to measure the water pressure and adjust it according to the manufacturer’s specifications, ensuring it is neither too high nor too low.
  • Step 4: Monitor for Consistency: After adjusting, monitor the water pressure over time to ensure it remains consistent and within the recommended range.
  • Step 5: Seek Professional Help if Needed: If water pressure issues continue or if you are unsure about making adjustments, consult with a professional technician for assistance.

Fix 7: Routine Maintenance and Regular Inspection

  • Step 1: Schedule Regular Inspections: Establish a routine to regularly inspect the unit, including the heating elements, water flow, air intake, and exhaust vents, to identify any issues early on.
  • Step 2: Perform Periodic Maintenance: Conduct periodic maintenance tasks such as cleaning and descaling to uphold the unit’s optimal performance and longevity.
  • Step 3: Address Issues Promptly: Any issues or irregularities detected during inspections should be addressed promptly, preventing them from escalating into more severe problems leading to error codes like E110.
  • Step 4: Review and Update Maintenance Practices: Based on the unit’s performance and any recurring issues, review and refine maintenance practices regularly to maintain the unit’s efficiency and reliability.
  • Step 5: Consult a Technician for Regular Check-ups: Even with routine self-maintenance and inspections, having a qualified technician perform regular check-ups can help in identifying and addressing hidden issues proactively.

By employing these additional fixes, owners can enhance the operational longevity of their Navien Tankless Water Heaters and mitigate the likelihood of encountering the error code E110, ensuring a consistent supply of hot water in their premises.

Fix 8: Reconfiguring Venting Systems

  • Step 1: Disconnect the Power: Before addressing venting issues, always disconnect the power and turn off the unit to avoid any safety hazards during the process.
  • Step 2: Refer to the Manufacturer’s Manual: It is essential to review the manufacturer’s manual to understand the correct venting configurations and requirements for your specific Navien Tankless Water Heater model.
  • Step 3: Inspect the Venting System: Carry out a detailed inspection of the venting system to identify any improper installations, damages, or blockages that may be causing the error code E110 to appear.
  • Step 4: Correct Venting Configuration: If any discrepancies in the venting configurations are found, make the necessary adjustments to align the venting system with the manufacturer’s guidelines. This may include adjusting the length of the vent, the type of materials used, or the vent termination.
  • Step 5: Ensure Proper Sealing: After adjusting the venting configurations, make sure all joints and connections in the venting system are properly sealed to prevent any leakages of exhaust gases.
  • Step 6: Test the Unit: Once the venting system is properly configured and sealed, turn on the unit and observe its operation. If the unit runs without displaying the error code E110, the venting issues have been successfully resolved.
  • Step 7: Seek Professional Assistance if Necessary: If the E110 error code persists or if there are uncertainties regarding the venting configurations, it is advisable to contact a qualified technician for a thorough inspection and professional advice on the necessary adjustments or repairs.
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By meticulously addressing the venting configurations, users can not only rectify the E110 error code but also enhance the efficiency and safety of their Navien Tankless Water Heaters, ensuring a seamless and reliable hot water supply in their homes.


Encountering error code E110 in a Navien Tankless Water Heater can be frustrating. However, understanding the causes behind this error and implementing the correct measures can resolve the issue efficiently. Regular maintenance, descaling the unit, clearing air intake and exhaust blockages, and seeking professional assistance when needed are crucial steps to fix this error and maintain the heater’s performance and longevity. By adhering to these practices, users can ensure the sustained reliability and efficiency of their Navien Tankless Water Heaters.


What does error code E110 signify on a Navien Tankless Water Heater?

Error code E110 typically indicates a problem related to the ignition or the flame of the unit.

How can I resolve the E110 error code?

You can resolve it by cleaning air intake filters, rectifying water flow, addressing heat exchanger issues, and regular maintenance.

Is regular maintenance crucial in avoiding error code E110?

Absolutely, regular maintenance helps in identifying and addressing issues early on, preventing error codes like E110.

Can improper installation lead to error code E110?

Yes, improper installation, especially incorrect venting configurations, can indeed lead to the E110 error code.