How To Reset Navien Tankless Water Heater?
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How To Reset Navien Tankless Water Heater? Admirable Complete Guide

Is your water heater not working properly or displaying an odd number on display, but you don’t know what it means? Do you want to know how to reset Navien tankless water heater? If so, this guide is for you. 

Like any other home appliance, your tankless water heater will surprise you with an unexpected Navien error code 110 eventually. Unluckily, it occurs always at an unpropitious time.

When a problem arises, your device will exhibit an error code on its LCD on the front. Obviously, it is not a pleasant experience, but it will help you figure out what is wrong with your unit.

You will be able to take action to resolve it at the right time. There are a huge number of distinct Navien error codes e351 that help with resolving the problem. You can solve some issues by resetting the unit, but others require additional work.

This article will provide you detailed information about Navien flow sensor problems and error codes along with their meaning and recommended fix.

You can mostly troubleshoot an issue on your own by using some tools, but you will have to hire professional services to fix complex issues. 

How To Reset Navien Tankless Water Heater?

How To Reset Navien Tankless Water Heater? Error Codes Breakdown

Tankless machines integrate complex technology, so errors and problems can occur at any moment. Below we will offer you a breakdown of different Navien water heater error codes and their solutions. 

Error Code E003

Navien error code 003 how to fix indicates that there is an ignition failure in your unit. 

Solution:
  • Ensure the main gas supply valve is open. 

Error Code E004

It means the false flame is detected in your device. 

Solution:
  • Make sure the major electrical cord is grounded correctly.

Error Code E012

It tells you that there was a flame loss. 

Solution:
  • Remove the intake filter and properly wash it using a brush beneath running water. Turn off the power before removing the filter. Allow it to dry for some time before fixing it again. 
  • Also, check if the electrical cord is grounded properly or not. 

Error Code E016

It means the heat exchanger is overheated. 

Solution:
  • Shut off the appliance for half an hour and then restart. Examine and clean the filter in a cold water inlet. You also have to flush the heat exchanger. 

Error Code E030

It informs you that the exhaust is overheating. The heater turns off automatically when the flue pipe surpasses 149 degrees Fahrenheit.

Solution:
  • Turn off the device for 30 minutes and then restart it. 
  • Remove the inlet filter and wash it under the running water with the help of a brush. 
  • Read the user’s Navien nr-240a manual to get information on how to flush the heat exchanger and how to reset remote for Navien tankless water heater. 

Error Code E046

It indicates that there is something wrong with limit control. 

Solution:
  • Get in touch with Navien technical support at 800-519-8794.

Error Code E047

It informs about the exhaust thermostat’s abnormality. 

Solution:
  • Get in touch with Navien technical support at 800-519-8794.

Error Code E060

When you see this code on display, it becomes compulsory to grab information about how to reset Navien tankless water heater. The number tells about the unusual operation of the Dual venturi. 

Solution:
  • Get in touch with Navien technical support at 800-519-8794.

Error Code E109

It provides information about the problem with the fan motor.

Solution:
  • Examine and wash the intake air filter underneath running water using a toothbrush. Allow it to dry and then fix it back.

Error Code E110

The Navien error code 110 informs about the strange air pressure. 

Solution:
  • Make sure the exhaust pipe is not obstructed. Check and remove the intake filter from the heater. Wash it under the water with a brush, let it dry, and then place it back. 

Error Code E127

It means that there is an issue with the air pressure sensor. It is caused by an open or shorted air pressure sensor.

Solution:
  • Turn off the device and examine the APS’s condition. Read the manual on Navien tankless water heater how to reset. If the problem persists after reset, replace the APS as soon as possible.

Error Code E205

This error code tells about the unusual operation of the heating supply thermistor. An open or shorted thermistor can cause it. 

Solution:
  • Examine the thermistor’s condition and pump wiring connectors.

Error Code E218

It shows that the heating return thermistor is not working correctly. An open or short thermistor can be the root cause of this problem.

Solution:
  • Check the thermistor’s condition along with pump wiring connectors.

Error Code E302

It gives information about the low water pressure. 

Solution:
  • Inspect the water feeder valve, water pressure, and water pressure relief valve. If necessary, replace them all.  

Error Code E352

This number indicates that the water pressure is high. 

Solution:
  • If your system displays this code, you need to confirm the water pressure is within good ranges. Also, check the feeder valve and pressure relief valve’s activity.

Error Code E353

It means there is some issue with a water pressure sensor. It can occur due to an open or short sensor. 

Solution:
  • Examine and confirm the pressure sensor and wiring are in good condition. Make sure there are no loose connections. You can replace the sensor if needed.  

Error Code E407

It is an indication that your warm water outlet thermistor has some problem. It normally occurs due to an open or shorted sensor.

Solution:
  • Examine the wiring and thermistor’s condition. Change the thermistor if needed.

Error Code E421

It means the cold water inlet 1 thermistor is not operating well.  

Solution:
  • Confirm the thermistor and wiring is in good condition. You can change the cold water inlet thermistor if necessary.

Error Code E432

It is a visible sign that your device’s cold water inlet 2 thermistor is having some issues.

Solution:
  • Check the wiring and cold water inlet 2 thermistor and make sure both are in good condition. If required, replace the thermistor.

Error Code E434

It shows that the water adjustment valve is not operating properly.

Solution:
  • Turn off the unit and check the valve’s wiring and condition. You can contact a plumber if necessary.

Error Code E438

It means the circulation pump is not working properly. 

Solution:
  • Ensure all return and supply lines are open and check the 2-way valve’s direction. 

Error Code E439

It tells you about the improper operation of the flow sensor. 

Solution:
  • Get in touch with Navien technical support at 800-519-8794.

Error Code E441 And E445

The error code E441 informs about the open thermistor or short circuit problem. The error code E445 tells about the defect of the bypass mixing valve.

Solution:
  • Get in touch with Navien technical support at 800-519-8794.

Error Code E480

It tells you about the abnormality of the external tank thermistor. An open or shorted sensor causes this issue. 

Solution:
  • You have to inspect the sensor’s connectors to confirm they are not wet and fixed correctly. You can change the tank thermistor if needed. 

Error Code E515

This code indicates the unusual operation of the PCB.

Solution:
  • Make sure the electrical cord is grounded.

Error Code E517

It shows that the DIP switch setting has some problems.

Solution:
  • Get in touch with Navien technical support at 800-519-8794.

Error Code E593 and E615

The E593 code means there is some issue with the front panel key. The E615 tells you about the irregularity in input and memory. 

Solution:
  • Get in touch with Navien technical support at 800-519-8794.

Error Code E736 and E740

The error code E736 informs about the issue in cascade communication, and error code E740 indicates that the outdoor temperature sensor is not working correctly.

Solution:

  • Get in touch with Navien technical support at 800-519-8794.

Error Code E760 And E782:

The E760 informs you that it’s time to flush your heater. Besides, the E782 indicates that there is something wrong with the main panel communication.  

Solution:
  • Get in touch with Navien technical support at 800-519-8794.

Error Code E783:

It means there is some issue with the OT-remote controller’s operation. 

Solution:
  • Examine the controller’s condition and replace it if required.

Error Code E785

It means there is some issue with the flow sensor or switch.

Solution:
  • Get in touch with Navien technical support at 800-519-8794.

Error Code E787

This error informs you there is something wrong while you reset the unit.

Solution:
  • Turn off the device for half an hour and confirm everything is working properly. Then, turn it on again. If the problem persists, call a technician to fix the unit.

Common Issues Of Navien Tankless Heater

Navien is renowned for producing high-quality water heaters worldwide. Initially, their products were not good enough and suffered numerous unexpected problems, but now they have stepped up, and glitches have become less frequent.

If you are using an old Navien model, here are some problems that you may have to deal with in the future or have experienced already. 

Heat Exchanger Cracking

It is not a common issue, but you should be aware of it. When the heat exchanger starts to crack, it means there is a gap, and destructive exhaust gasses could enter your residence.

You will have to replace the heat exchanger because it cannot be fixed. A warranty covers the heat exchanger, so you should call the manufacturer. 

Motherboard Or Control Board Failure

The motherboard or control board failure is widespread. Both are the unit’s “brains” responsible for receiving and transmitting information in the heater.

When they both stop working, it indicates that there is some major issue with the device itself. This issue frequently occurs in older models. You can easily detect this problem.

Your machine will switch off and on repeatedly. If it does not turn on and off, you will see Navien error code 003 how to fix on the display screen. This code informs you about ignition failure.

The ideal way to resolve this problem is to turn off the heater for some time and restart it. If the trouble persists, replace the control board or get in touch with the plumber for help.

Corrosion Of Navien Flow Sensor Problems

It is the most infuriating problem with the brand’s older models. The flow sensors were made of substances that were prone to rust. A flow sensor is a vital component of the tankless appliance.

It detects the incoming water flow and then turns on the heater. When the flow sensor is rusted, the unit shuts down. Corrosion accumulation will become a cause of reduced operation.

It is a temporary problem that can be fixed instantly. Turn off the device and find out the flow sensor, remove it, and blow on it. Put it back and activate the unit.

The brand has fixed this problem by changing the flow sensor materials. Nowadays, they utilize stainless steel that resists rust. If you have an older heater, replace the flow sensor with the newest one; otherwise, install a 5-micron filter in the unit.

Navien Tankless Water Heater How To Reset

If your device is not working correctly and not displaying any error code, you can reset it. Resetting is very easy and does not require any special tools or plumbing skills.

Locate the reset button on the heater’s front control panel. You can find it in the lowest corner opposite the on and off button. Press the reset button to reset your device. However, if you have tried everything but got no results, hire a plumber.

Conclusion:

Modern tankless units are capable of creating limitless hot water to cater to whole-house needs. They incorporate innovative technology and are highly energy-efficient.
But, they are not perfect, and problems do occur sometimes. Fortunately, the brand has included numerous error codes to help you determine the issue easily.
If you cannot figure out the exact meaning of Navien no hot water no error code, recite the user’s manual or read our guide on how to reset Navien tankless water heater.

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