How to Relight a Navien Tankless Water Heater: Easy Steps!

Navien tankless water heaters are magical devices that provide hot water without a tank! But, to get them to work properly, there are a few steps you must take.

  1. Firstly, you need to locate the reset button, which is usually found on the front panel. Press and hold the reset button for 5 seconds and that should fix any potential issues.
  2. If the reset button doesn’t work, there may be a flow problem. To fix this, turn off power and gas supply valves, and attach hoses to both the hot and cold water inlets. Let water flow through until clean water is observed.
  3. Another issue that can occur is a clogged intake filter or heat exchanger. Turn off power and gas supply valves, and remove the front panel to locate the filters. Remove and rinse them with clean water to remove any debris.
  4. Finally, if all else fails, it may be best to contact a qualified technician who can diagnose and repair the issue.

Image of the Navien tankless water heater

Key Takeaways

  • 1. Turn off the power and gas supply to the water heater before attempting to relight it. This is important for safety reasons and to prevent any accidents.
  • 2. Locate the control panel on the front of the water heater. It will have buttons and a digital display that shows the current temperature and settings.
  • 3. Press and hold the power button on the control panel for a few seconds to turn on the water heater. The display should light up, indicating that it is ready to be relit.
  • 4. Check the gas supply valve to ensure it is open. If it is closed, turn it counterclockwise to open it and allow gas to flow to the water heater.
  • 5. Locate the igniter button on the control panel. Press and hold it for a few seconds to ignite the gas and start the heating process.
  • 6. Once the gas is ignited, you should hear a clicking sound and see a flame inside the water heater. This indicates that the water heater has been successfully relit.
  • 7. Adjust the temperature settings on the control panel to your desired level. You can use the up and down buttons to increase or decrease the temperature as needed.
  • 8. Monitor the water heater for a few minutes to ensure it is functioning properly and producing hot water. If you notice any issues or unusual sounds, it may be necessary to contact a professional for further assistance.
  • 9. Remember to regularly maintain and clean your Navien tankless water heater to ensure optimal performance and longevity. This includes descaling the unit and checking for any leaks or malfunctions.
  • 10. If you are unsure or uncomfortable with relighting the water heater yourself, it is always best to contact a professional plumber or technician who can safely and efficiently handle the task.

Understanding the Navien Tankless Water Heater

The Navien Tankless Water Heater: bringing hot water on-demand! It offers energy savings and a continuous flow of hot water. Let’s break down its key components:

  • Control Panel: An intuitive interface that lets you adjust the temperature and monitor the unit’s performance.
  • Heat Exchanger: Transfers heat from the burner to the water.
  • Gas Valve: Controls the flow of gas to the burner, ensuring optimal combustion.
  • Igniter: Sparks the burner to ignite the gas and start the heating process.
  • Air Intake Filter: Filters out dust and debris coming in.
  • Water Inlet Filter: Removes impurities from incoming water.
  • Flow Sensor: Measures water flow rate for accurate heating control.
  • Recirculation Pump: Optional feature that circulates hot water through your plumbing for fast delivery.

Did you know certain error codes can be reset? Locate the reset button on the front panel/control panel, press and hold for a few seconds until all lights turn off. Release and wait for the unit to restart.

To illustrate the importance of understanding your Navien Tankless Water Heater, a friend recently experienced their unit shutting off with an error code indicating low water flow. After checking the intake filter for blockages, they found a build-up of sediment and debris. Flushing out the filter solved the issue.

Common Issues with Navien Tankless Water Heaters

Relighting a Navien Tankless Water Heater is like rekindling a lost flame, but with more buttons and less romance. Locate the reset button on the front panel. Press it for three seconds to reignite the pilot light. Then, you’ll have hot water again!

A blocked or clogged intake filter can decrease water flow and result in lower temperature or no hot water. Turn off the power supply. Remove and clean the air intake filter. Replace if necessary. Then, reinstall and turn on the power.

Error codes on the control panel may indicate gas valve failure, igniter issue, or flow sensor malfunction. Each code corresponds to a problem. Check the user manual or contact a technician for troubleshooting steps.

In my experience, I got no hot water despite everything seeming to be in order. After checking all possible causes, I replaced a valve and hot water was restored.

Navien Tankless Water Heaters save energy and provide continuous hot water. But, they can have issues. Be aware of common issues like relighting, intake filter cleaning, and error code troubleshooting. Then, you can keep your Navien Tankless Water Heater running smoothly.

How to Relight a Navien Tankless Water Heater

Tankless water heaters offer convenience and efficiency. But, like any appliance, they may require relighting from time to time. If you’re wondering how to relight a Navien tankless water heater, here’s your guide.

Locate the reset button. It’s usually on the front panel. Press and hold it for 3 seconds until the screen displays “000”. This will clear error codes preventing the heater from igniting.

Check the air intake filter for dirt or debris that may block airflow. Clean or replace the filter if needed.

Switch off all hot water fixtures in your home. Open a nearby hot water faucet fully and wait for a minute to purge any air from the system. Then, press the power button to ignite the unit.

Some details should be considered when relighting. Check if there is an error code displayed, and make sure gas flow is uninterrupted by checking gas valves and power supply.

To prevent future problems, do regular maintenance on your Navien tankless water heater. Clean or replace filters and flush out mineral deposits. Ensure proper water pressure and address any flow sensor or inlet filter issues. Consider installing a recirculation pump or a ComfortFlow system.

If you’re uncertain about relighting, contact a professional technician for assistance. They will have the expertise to restore your hot water supply.

Flushing the Navien Tankless Water Heater

Flush your Navien Tankless Water Heater for better performance! It’s an important maintenance task to avoid damage and reduce mineral buildup. Here’s a step-by-step guide to help you get started:

  1. Power off: Disconnect the electrical cord or switch off the circuit breaker.
  2. Close valves: Find the isolation valves on the hot and cold water lines then turn them clockwise to close.
  3. Connect hoses: Attach a garden hose to both the hot and cold water service ports on the heater’s front panel. Tighten with a wrench or pliers.
  4. Open drain valve: Find the drain valve located at the unit’s bottom. Place a bucket or container to collect the flushed water.
  5. Flush with vinegar: Mix equal parts of white vinegar and water in a container. Connect a hose to one end of a submersible pump, then place it in the solution. Connect the other end to one of the service ports.
  6. Start the flush: Switch on the pump to circulate the vinegar. Let it run for around 45 minutes then turn off both the pump and the drain valve.

Follow these tips:

  • Read your Navien manual for safety guidelines.
  • Flush your tankless water heater at least once a year.
  • Ask a certified technician for help if unsure.

Now you know how to flush your Navien Tankless Water Heater! Maintenance helps you enjoy hot water continuously and avoid costly repairs. Don’t be left in hot water – maintain your Navin with ease.

Maintaining the Navien Tankless Water Heater

Maintaining your Navien tankless water heater is key to its performance and longevity. Here’s a step-by-step guide:

  1. Flush the System: To remove any mineral deposits or sediments, turn off the power supply and close the gas valve. Connect a hose to the cold water inlet and drain valves, open both valves and let water flow for 45 minutes.
  2. Clean the Air Intake Filter: Find the air intake filter on the front panel. Clean it with a soft brush or warm soapy water. Make sure it’s dry before putting it back.
  3. Check for Error Codes: Keep an eye out for error codes on the control panel. Each code corresponds to an issue. Check the user manual or contact a technician for help.
  4. Inspect Water Inlet Filter: Regularly inspect and clean the cold water inlet filter at the bottom of the unit. Unscrew it, rinse it under running water, and screw it back in securely.
  5. Schedule Yearly Maintenance: Consider getting yearly maintenance from a certified Navien tankless water heater technician. They’ll perform checks, spot potential issues, and ensure optimal functioning.
  6. Monitor Water Pressure: Look out for water pressure fluctuations as they could indicate an issue with plumbing or external factors.

Image of a water inlet filter of tankless water heater

These are general steps. Refer to the manufacturer’s manual for specific instructions or troubleshooting.

Fun fact: Navien tankless water heaters have an Energy Factor (EF) rating of up to 0.97, making them energy-efficient and saving you money!

Frequently Asked Questions

FAQs about How to Relight a Navien Tankless Water Heater:

1. How do I relight a Navien tankless water heater?

A: To relight a Navien tankless water heater, locate the ignition button on the front control panel. Push and hold the button for about five seconds until the igniter clicks and the flame ignites. Release the button and verify that the heater is securely lit.

2. Where is the reset button on a Navien tankless water heater?

A: The reset button on a Navien tankless water heater is usually located on the front control panel. It is a small button labeled “reset” or identified by a circular arrow symbol. Press this button to restart the system.

3. How do I flush a Navien tankless water heater?

A: To flush a Navien tankless water heater, turn off the power supply and close the water valves. Connect a garden hose to the cold water inlet valve and place the other end into a suitable drainage area. Open the purge valves and turn on the hot water tap to allow the system to flush for about 45 minutes. Once complete, close the purge valves, remove the hose, and open the water valves.

4. Why is my Navien water heater not working?

A: There can be several reasons why a Navien water heater is not working. These may include insufficient water flow, a clogged air intake filter, malfunctioning gas valves, or power supply issues. It is recommended to check the error codes displayed on the control panel and refer to the user manual for troubleshooting steps.

5. What are the common error codes on Navien tankless water heaters?

A: Common error codes on Navien tankless water heaters include E003 (ignition failure), E012 (gas valve abnormality), E027 (combustion failure), and E045 (recirculation pump abnormality). Each error code indicates a specific issue with the system, and consulting a professional technician may be necessary to diagnose and resolve the problem.

6. What maintenance is required for Navien tankless water heaters?

A: Regular maintenance for Navien tankless water heaters includes cleaning the air intake filter and checking the water inlet and cold water inlet filters for debris. It is also recommended to perform yearly maintenance by a qualified technician to ensure optimal performance and prevent potential issues.


The guide below can help you relight a Navien tankless water heater. Find the reset button and read the manufacturer’s instructions to flush it.

When relighting, check for flow or ignition issues. Clean or replace filters, check valves or get a steady power supply. Look at the control panel for error codes and use the manual for help.

For better performance, treat hard water. Mineral deposits can clog the system. Regularly maintain and clean the heat exchanger, intake filter, and other parts.

An example: A Navien tankless water heater owner had no hot water. They checked the intake filter and valves, but then they realize the gas supply was off. Once they switched it back on, the water heater functioned normally.