How To Troubleshoot Navien Tankless Water Heater Error Codes

How To Troubleshoot Navien Tankless Water Heater Error Codes

Navien tankless water heaters are renowned for their energy efficiency, compact design, and consistent hot water supply. However, like any appliance, issues can arise, often signaled by error codes related to the water heater parts or system. Understanding these codes and knowing how to troubleshoot them is key to maintaining your unit and ensuring it continues to function properly. In this guide, we’ll cover some of the most common Navien error codes, what they mean, and how to resolve them, helping you avoid unnecessary repairs and maintain the performance of your unit.

Common Navien Error Codes and How to Troubleshoot Them

Here are some common Navien error codes and troubleshooting tips to help resolve them quickly and effectively.

1.Error Code E012: No Running Hot Water

If your Navien unit displays the E012 error code, it indicates that the unit is failing to supply hot water. This can be due to issues with water flow, gas supply, or the internal heating elements.

Troubleshooting Steps:

1. Check Water Flow: Make that the water supply valves are open and that there is adequate water pressure. Clogged filters or obstructed water lines can cause issues.

2. Make sure the gas valve is open and the gas pressure is sufficient by checking the gas supply. If the gas pressure is low, the device might not be able to heat the water sufficiently.

3. Flush the Heat Exchanger: If the heat exchanger is clogged with debris or scale buildup, it may prevent water from being heated. Clean or flush the heat exchanger with an appropriate solution to remove any blockages.

   
   

2.Error Code E011: Ignition or Flame Failure

The E011 error code is one of the most common errors. It typically occurs when the unit fails to detect ignition or a proper flame. This can be caused by a dirty flame sensor, gas supply issues, or poor venting.

Troubleshooting Steps:

1. Make sure that the gas supply is turned on and that there are no obstructions in the gas line.

2. Clean the Flame Sensor: A dirty flame sensor is frequently the source of this issue. Use a soft cloth or brush to clean the flame sensor to remove any accumulation or debris.

3. Inspect Venting: Ensure that the exhaust vent is clear of any debris. Blocked venting can prevent proper combustion, leading to flame detection failure.

4. Reset the Unit: After addressing the issues above, reset the unit to see if the error code clears.

   
   

3.Error Code E004: False Flame Detection

The E004 error code occurs when the unit detects a false flame, meaning the unit thinks it has ignited but no actual flame is present. This may be the result of combustion problems or a flame sensor malfunction.

Troubleshooting Steps:

1. Clean the Flame Sensor: A false flame error may be caused by a dirty or broken flame sensor. To get the sensor working properly again, clean it.

2. Check Gas Supply: Ensure that the gas pressure is adequate and that there is no blockage in the gas line.

3. Examine the Burner Assembly: A clogged burner can prevent proper ignition. Clean the burner and make sure it's operating properly.

4. Ensure Proper Venting: Poor venting can lead to combustion issues. Verify that the exhaust vent is clear and properly installed.

   
   

4.Error Code E016: Overheating Heat Exchanger

The E016 error code indicates that the heat exchanger has overheated. This may happen due to a buildup of debris or scale, insufficient water flow, or malfunctioning sensors.

Troubleshooting Steps:

1. Clean the Inlet Water Filter: The machine may overheat if the filter is clogged since it will restrict water flow. Clean or replace the filter as needed.

2. Inspect the Heat Exchanger: Check for any scale buildup or blockages in the heat exchanger. To get rid of any clogs, flush it with a cleaning solution.

3. Check Water Flow: Low water pressure or blocked pipes can cause overheating. Make sure there are no obstructions in the water lines and that all of the water valves are open.

   
   

5. Error Code E030: Exhaust Overheat

When the E030 error code appears, the exhaust high limit switch is activated to shut down the unit because the exhaust temperature has risen above the safe limit. This could be due to poor venting or a blocked exhaust system.

Troubleshooting Steps:

1. Inspect the Venting System: Check the vent line for any obstructions or blockages. Clear any debris that might be restricting airflow.

2. Clean the Heat Exchanger: Scale or debris buildup in the heat exchanger can cause exhaust to overheat. Flush the heat exchanger with a cleaning solution to remove any buildup.

3. Assure Proper Ventilation: Confirm that there is sufficient airflow and that the exhaust vent is fitted correctly. If the venting system is too long or improperly sized, it can cause exhaust temperatures to rise.

   
   

6. Error Code E018: Thermistor Open

The E018 error code points to an issue with the heating return inlet thermistor. When the thermistor is open, it prevents the unit from properly regulating the water temperature.

Troubleshooting Steps:

1. Inspect the Thermistor: Check for any visible damage to the thermistor. If it is defective, it must be replaced.

2. Examine the Wiring: Verify that the thermistor's wiring is safe and undamaged. A loose or disconnected wire can trigger this error.

3. Replace the Thermistor: If the thermistor is damaged or malfunctioning, it will need to be replaced to resolve the issue.

Understanding and troubleshooting Navien tankless water heater error codes helps maintain your unit’s efficiency and prevent costly repairs. If issues persist beyond simple fixes, it's advisable to consult a professional technician to ensure reliable hot water for years to come.