Why Does My Navien Water Heater Keep Shutting Off?

The navien water heater may be shutting off due to a variety of issues, such as a malfunctioning thermostat or a blocked vent. When the water heater shuts off, it is important to troubleshoot the problem to prevent further issues.

Navien water heaters are known for their efficiency and performance. However, it can be frustrating when your water heater keeps shutting off. There are several reasons why this might be happening, including a faulty thermostat, inadequate water flow, or a blocked vent.

Troubleshooting these issues can help identify the problem and ensure that your navien water heater functions properly. We will explore the common causes for a navien water heater shutdown and provide solutions to help you resolve the issue.

Why Does My Navien Water Heater Keep Shutting Off?

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Understanding The Common Causes For Shutdowns

Why Does My Navien Water Heater Keep Shutting Off?

If you’re experiencing frequent shutdowns with your navien water heater, it can be frustrating and inconvenient. Understanding the common causes behind these shutdowns can help you troubleshoot the issue and potentially avoid costly repairs. In this section, we’ll explore three key factors that may contribute to your navien water heater shutting off: ignition failure, flame sensor issues, and air supply problems.

Ignition Failure

  • The water heater’s ignition system plays a crucial role in the heating process. If the ignition fails, it can result in the unit shutting down. Here are some possible causes of ignition failure:
  • Gas supply issues: Check if there is a sufficient supply of gas to the water heater. Low or no gas flow can prevent proper ignition.
  • Pilot light problems: Ensure that the pilot light is lit and remains stable. A weak or extinguished pilot light can lead to ignition failure.
  • Faulty ignition components: The ignition electrode or spark generator may be damaged or malfunctioning, preventing the ignition process.

Flame Sensor Issues

  • The flame sensor is responsible for detecting whether the burner is lit or not. If the sensor fails to detect a flame, it will signal the system to shut off. Here are some potential causes of flame sensor issues:
  • Dirt and debris buildup: Over time, dust, dirt, or other debris can accumulate on the flame sensor. This buildup interferes with its ability to detect the flame correctly, leading to shutdowns.
  • Sensor placement: Ensure proper placement of the flame sensor to ensure it can accurately detect the burner’s flame.
  • Faulty flame sensor: If the flame sensor itself is faulty or damaged, it may not function correctly, triggering unnecessary shutdowns.

Air Supply Problems

  • Adequate airflow is crucial for the proper functioning of your navien water heater. Restricted airflow can cause the unit to shut down unexpectedly. Consider the following factors related to air supply:
  • Vent blockages: Check for any obstructions in the venting system or exhaust pipe that may impede the flow of air. Clearing any blockages can help prevent shutdowns.
  • Ventilation issues: Ensure that the water heater is installed in an area with proper ventilation. Insufficient ventilation can lead to overheating and automatic shutdowns.
  • Inadequate combustion air: If there isn’t enough combustion air available for the water heater, it may struggle to operate efficiently, resulting in frequent shutdowns. Ensure proper airflow to prevent this issue.

Understanding these common causes for shutdowns can give you a starting point to troubleshoot your navien water heater. In some cases, you may be able to resolve the issue on your own. However, if you’re unsure or the problem persists, it’s recommended to consult a professional technician to diagnose and fix the problem accurately.

Remember, regular maintenance and inspections can help prevent future shutdowns and extend the lifespan of your water heater.

Troubleshooting Ignition Failure

Navien water heaters are known for their efficiency and reliability. However, like any appliance, they can experience issues at times. One common problem that navien water heater owners encounter is the unit consistently shutting off, specifically due to ignition failure.

If you’re facing this issue, fret not! In this section, we will delve into troubleshooting ignition failure, helping you identify and resolve the root cause of the problem.

Checking The Gas Supply

  • Ensure that the gas supply to the unit is turned on. Sometimes, due to accidental interference or maintenance work, the gas supply might have been interrupted.
  • Check the gas valve to verify that it is fully open. If it’s partially closed, it can restrict the gas flow, leading to ignition failure.
  • If you suspect a gas leak, it is imperative to contact a professional for immediate assistance. Gas leaks can be dangerous and should be dealt with by trained technicians.
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Inspecting The Ignition Components

  • Begin by inspecting the ignition cables for any visible signs of damage, such as fraying or cracking. Damaged cables can hinder the ignition system’s performance, resulting in frequent shutdowns.
  • Verify that the spark electrodes are in proper working condition. Over time, these electrodes can become dirty or corroded, impeding their ability to generate a spark for igniting the gas.
  • Examine the flame rod to ensure it is clean and free from any build-up or debris. A dirty flame rod can interfere with the ignition process, leading to a shutdown.

Cleaning/Replacing The Ignition Electrodes

  • If the ignition electrodes appear dirty or corroded, cleaning them might resolve the issue. Gently remove any accumulated dirt or residue using a soft brush or cloth.
  • In more severe cases, cleaning might not be sufficient, and replacing the ignition electrodes could be necessary. Consult the navien user manual or contact a professional to ensure proper installation.

Remember, if you’re uncomfortable performing any of the troubleshooting steps or if the issue persists even after troubleshooting, it’s best to contact a qualified technician. They will have the expertise and knowledge to diagnose and resolve the problem effectively. By addressing ignition failure promptly, you can ensure the continued operation of your navien water heater.

Fixing Flame Sensor Problems

Is your navien water heater constantly shutting off? One common issue that could be causing this problem is a faulty flame sensor. The flame sensor is responsible for detecting whether or not there is a flame present in the burner assembly.

If the sensor fails to detect a flame, it will shut off the gas supply to the burner, resulting in your water heater shutting off. In this section, we will discuss some troubleshooting steps to fix flame sensor problems.

Cleaning The Flame Sensor

Cleaning the flame sensor is often the first step in resolving any issues it may be experiencing. Over time, the sensor can become dirty or covered in debris, hindering its ability to properly detect the flame. Follow these steps to clean the flame sensor:

  • Turn off the power to the water heater at the circuit breaker.
  • Locate the flame sensor, typically located near the burner assembly.
  • Gently remove the sensor using a screwdriver or pliers.
  • Inspect the sensor for any visible dirt or debris.
  • Using a soft cloth or brush, carefully clean the sensor, ensuring all surfaces are free from dirt.
  • Once cleaned, reinsert the sensor back into its original position.
  • Turn the power back on and test if the water heater stays on without shutting off.

Cleaning the flame sensor is a simple and effective way to address potential issues and may solve the problem of your navien water heater shutting off.

Adjusting The Flame Sensor Position

If cleaning the flame sensor does not fix the issue, it may be necessary to adjust its position. Sometimes, the sensor can become misaligned, resulting in inaccurate flame detection. Follow these steps to adjust the flame sensor position:

  • Turn off the power to the water heater at the circuit breaker.
  • Locate the flame sensor and determine if it is properly aligned with the burner assembly.
  • Use a screwdriver to loosen the screw holding the sensor in place.
  • Gently move the sensor to achieve proper alignment with the flame.
  • Retighten the screw to secure the sensor in its new position.
  • Turn the power back on and test if the water heater stays on without shutting off.

Properly aligning the flame sensor can ensure accurate flame detection and prevent your navien water heater from shutting off unexpectedly.

Replacing Faulty Flame Sensors

In some cases, the flame sensor may be faulty and need to be replaced. If cleaning and adjusting the sensor do not resolve the issue, it is worth considering replacing it. Follow these steps to replace a faulty flame sensor:

  • Turn off the power to the water heater at the circuit breaker.
  • Locate the flame sensor and disconnect any wires connected to it.
  • Remove the screw holding the sensor in place and carefully take out the sensor.
  • Install the new flame sensor in the same position as the old one.
  • Secure the sensor in place using the screw.
  • Reconnect the wires to the new flame sensor.
  • Turn the power back on and test if the water heater stays on without shutting off.

Replacing a faulty flame sensor can ensure proper functioning of your navien water heater and prevent any further shutdowns due to flame detection issues.

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By following these troubleshooting steps, you can address flame sensor problems and prevent your navien water heater from shutting off unexpectedly. Remember to always exercise caution and consult a professional if you are unsure or uncomfortable performing these tasks yourself.

Addressing Air Supply Issues

If your navien water heater keeps shutting off, it could be due to air supply issues. These issues can cause improper combustion and result in the system shutting off as a safety measure. Here are some steps you can take to address air supply problems:

Clearing Obstructions In The Venting System

  • Inspect the venting system for any obvious obstructions such as debris, leaves, or nests.
  • Use a flashlight to ensure there are no blockages or restrictions in the vent pipes.
  • Clear any obstructions found using a long brush or by disassembling and cleaning the pipes if necessary.

Checking And Cleaning The Air Intake Filter

  • Locate the air intake filter, which is usually located near the bottom of the water heater.
  • Remove the filter and inspect it for dirt, dust, or debris.
  • If the filter is dirty, clean it by gently tapping it or brushing off the accumulated particles.
  • If the filter is damaged or excessively dirty, replace it with a new one.

Adjusting The Combustion Air Damper

  • Find the combustion air damper, typically located at the bottom or side of the water heater.
  • Ensure that the damper is fully open to allow sufficient air intake.
  • If the damper is partially closed or obstructed, adjust it to the right position.
  • Test the water heater again to see if the issue of it shutting off persists.

Remember to always consult the manufacturer’s manual for specific instructions regarding your navien water heater model. By addressing air supply issues, you can potentially resolve the problem of your water heater repeatedly shutting off and ensure a consistent flow of hot water in your home.

Maintenance Tips To Prevent Frequent Shutdowns

Navien water heaters are known for their efficiency and durability, but if your unit keeps shutting off unexpectedly, it can be frustrating. Understanding the possible causes and implementing proper maintenance techniques can help prevent frequent shutdowns. In this section, we’ll discuss some essential maintenance tips to ensure your navien water heater operates smoothly and reliably.

Let’s dive in!

Flushing The Water Heater Regularly

Regularly flushing your navien water heater plays a vital role in maintaining its optimal performance. Over time, mineral deposits and sediments can accumulate inside the tank, hindering its efficiency and causing the system to shut off frequently. To prevent this, follow these guidelines:

  • Schedule a routine flushing at least once a year to remove any build-up.
  • Turn off the power and water supply to the heater before beginning the flushing process.
  • Connect a garden hose to the drain valve and direct the other end to a suitable drainage area.
  • Open the valve to allow the water to flow out and flush the tank thoroughly.
  • Close the drain valve and refill the tank before restoring power and water supply.

Regular flushing helps prevent clogs, maintains proper water flow, and reduces the chances of unexpected shutdowns.

Performing Routine Inspections

Performing routine inspections on your navien water heater can help identify and address potential issues before they lead to frequent shutdowns. Consider the following key points:

  • Visually examine the unit for any signs of leaks, corrosion, or damage.
  • Check the pressure relief valve to ensure it’s functioning correctly.
  • Inspect the gas supply line and connections for any leakages or loose fittings.
  • Examine the venting system for any obstructions or blockages that could restrict proper airflow.
  • Test the temperature and pressure settings to ensure they’re within the recommended range.

By regularly inspecting your navien water heater, you can catch and resolve minor problems promptly, preventing frequent shutdowns and extending the lifespan of your unit.

Keeping The Area Around The Water Heater Free Of Debris

Maintaining a clean and clutter-free area around your navien water heater is essential for its efficient operation. Here are some key tips:

  • Remove any debris, dust, or flammable materials like paper or cardboard that may have accumulated around the unit.
  • Clear the surrounding area to allow proper air circulation and prevent potential overheating issues.
  • Keep the water heater away from chemicals, solvents, or any other substances that could damage the unit or its components.
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Maintaining a clean and debris-free environment around your navien water heater not only ensures optimal performance but also reduces the chances of unexpected shutdowns caused by heat-related issues or obstructions.

Following these maintenance tips and practicing regular care can significantly minimize the risk of your navien water heater shutting off frequently. By keeping the tank flushed, performing routine inspections, and maintaining a clean area around the unit, you can enjoy continuous hot water without interruption.

Stay proactive in caring for your water heater, and it will reward you with efficient and reliable performance for years to come.

Professional Help: When To Call A Technician

Is your navien water heater constantly shutting off? Dealing with an unreliable water heater can be frustrating and inconvenient. While there are some diy fixes you can try, there are instances when it’s best to call in a professional technician.

Understanding when to seek expert help can save you time, money, and potential damage to your water heater. Here are the key points to consider:

  • #### understanding when diy fixes are inadequate

While it may be tempting to tackle water heater issues on your own, there are certain situations where diy fixes may not be enough. It’s important to recognize when it’s time to call a technician:

  • Complex problems: If the issue seems complex and beyond your understanding or skill level, it’s best to leave it to the professionals. Trying to fix a problem you’re not familiar with could cause further damage.
  • Electrical troubles: Any electrical issues involving your water heater should be addressed by an expert. Working with electricity can be dangerous and requires specialized knowledge.
  • Gas leaks: If you suspect a gas leak, it’s crucial to immediately contact a professional. Gas leaks pose serious safety risks and should never be handled without proper expertise.
  • Warranty concerns: If your water heater is still under warranty, attempting repairs yourself could void the warranty. Always check the terms and conditions before taking any action.
  • #### finding a reliable service provider

When looking for a technician to help with your navien water heater, it’s essential to find a reliable service provider. Here are some considerations to keep in mind:

  • Experience and expertise: Look for a company or technician with experience working specifically with navien water heaters. Their knowledge and expertise will ensure they can accurately diagnose and repair any issues.
  • Credentials and certifications: Verify that the technician you hire is properly licensed and certified. This guarantees they have the necessary training and qualifications to handle the job.
  • Reputation and reviews: Read reviews and testimonials from previous customers to gauge the company’s reputation. Positive feedback and high ratings are indicators of a reliable service provider.
  • Trustworthy recommendations: Seek recommendations from friends, family, or neighbors who have had positive experiences with water heater technicians. Personal referrals can often lead to trusted professionals.
  • #### scheduling regular maintenance

Even if your navien water heater is functioning well, it’s important to schedule regular maintenance to prevent future issues. Here’s why maintenance is crucial:

  • Ensure efficient performance: Regular maintenance helps keep your water heater operating at its best, ensuring maximum energy efficiency and cost savings.
  • Prolong lifespan: Proper maintenance can extend the lifespan of your water heater by preventing wear and tear and addressing minor issues before they become major problems.
  • Identify potential problems: During maintenance visits, technicians can identify any potential issues and address them proactively, saving you from unexpected breakdowns and repair costs.

By understanding when diy fixes are inadequate, finding a reliable service provider, and scheduling regular maintenance, you can ensure that your navien water heater keeps running smoothly without sudden shutdowns. Don’t hesitate to reach out to a professional technician when needed – your comfort and peace of mind is worth it.


In a nutshell, understanding why your navien water heater keeps shutting off is essential for ensuring a consistent and reliable supply of hot water. By addressing common issues such as improper gas pressure, insufficient combustion air, or a faulty sensor, you can prevent unexpected shutdowns and maintain optimal performance.

Regular maintenance, including cleaning filters and flushing the system, will also help identify any potential issues and keep your navien water heater running smoothly. Additionally, consulting the user manual and reaching out to professional technicians for assistance is crucial in troubleshooting specific problems.

Remember, the key to a well-functioning navien water heater is prompt identification and resolution of any issues, ensuring a continuous and efficient supply of hot water for your household.


I am a mechanical engineer and love doing research on different home and outdoor heating options. When I am not working, I love spending time with my family and friends. I also enjoy blogging about my findings and helping others to find the best heating options for their needs.