Navien tankless water heater troubleshooting

Navien tankless water heater troubleshooting

  • Navien tankless water heater troubleshooting is necessary to get it into perfect working condition. A Navien tankless water heater is famous among many homeowners due to its energy efficiency and continuous hot water supply. While you use a Navien tankless water heater, you have little reason to worry about the sufficiency of the hot water supply or the energy consumed in the process.

  • Another exciting aspect of this heater is the instantaneous heating of water; you don’t need to wait at your faucet before turning the water on, except if it is faulty. You need some Navien tankless water heater troubleshooting knowledge if it is faulty.

  • Like any appliance, it may encounter issues that need troubleshooting. One common problem with tankless water heaters is insufficient hot water. If your tankless water heater is not producing enough hot water, there are several potential causes to consider.
Navien tankless water heaters are known for their efficiency and reliability. However, like any other appliance, they can sometimes encounter problems. Some common Navien tankless water heater problems include inadequate hot water, fluctuating water temperatures, error codes, leaking, and noisy operation. 

You may even experience less hot water than usual. These are some Navien water heater problems you may encounter during frequent usage. These issues can also be caused by factors such as a dirty or clogged filter, improper installation, insufficient gas supply, etc. Below, we will treat these problems, one after the other, and offer necessary solutions.

Table of Contents

Navien Tankless Water Heater Leaking

If your Navien tankless water heater is noticeably leaking, it is essential to take action immediately. A leaking water heater can lead to serious water damage in your home and should not be ignored. There are several possible reasons for a Navien tankless water heater to leak. It leaks when there is a faulty pressure relief valve, a cracked heat exchanger, or a loose connection. A Navien water heater, not properly installed, can also cause a significant problem. Contrary to many opinions, troubleshooting a Navien tankless water heater is not so difficult. Follow the instructions below;

What to do: 

1. Turn Off the Unit:

The first step is to turn off the water heater. Locate the power switch or circuit breaker that controls the unit and turn it off. This will help prevent further water leakage and potential electrical issues.

2. Turn Off the Water Supply:

Close the cold water supply valve that feeds water into the tankless water heater. This will stop the flow of water into the unit and minimize the amount of water leaking.

3. Drain the Water Heater:

If possible, drain the remaining water from the unit. A drain valve may be located at the bottom of the water heater. Connect a hose to the drain valve and direct the water to a suitable drainage location.

4. Inspect and Identify the Source:

Carefully inspect the unit to identify the source of the leak. Leaks can occur at various points, such as connections, valves, pipes, or internal components. Look for any visible signs of damage or corrosion.

5. Address the Issue:

Depending on the source of the leak, you may need to take different steps:

    • Leaking Connections: Tighten any loose connections or fittings. Use caution not to overtighten, as this could cause further damage.

    • Faulty Valves: If a valve leaks, it may need replacement. Consult your user manual or contact a professional technician for guidance.

    • Internal Component Leaks: If the leak comes from within the unit, such as a cracked heat exchanger, it’s best to contact a professional technician. Internal component repairs may require specialized tools and expertise.

6. Contact a Professional Technician:

If the problem persists after troubleshooting, it is recommended that you contact a certified Navien technician. Water heater leaks can lead to significant damage and should be addressed promptly by a qualified professional.

7. Document the Leak:

It’s a good idea to document the leak before you repair it or contact a technician. Take photos or videos of the leak and the surrounding area. This documentation may be helpful for the technician in diagnosing and addressing the issue. It is a proven way of solving your Navien tankless water heater problems.

How to reset the Navien boiler; A step-by-step procedure

Navien boilers should be reset for several reasons. Resetting the boiler can help resolve minor issues or malfunctions that may occur during operation. Resetting the boiler allows the system to restart and clear any temporary errors or glitches that may be causing the problem. Another reason to reset a Navien boiler is to restore it to its default settings.

 Follow these steps:

1. Locate the Power Button:

Find the power button or switch on your Navien boiler. It’s usually located on the control panel or near the unit.

2. Turn Off the Boiler:

Press and hold the power button for 5 to 10 seconds to turn off the boiler. This action should shut down the unit altogether.

3. Wait for a Moment:

After turning off the boiler, wait for a few seconds to allow any residual power to dissipate.

4. Turn On the Boiler:

Press the power button again to turn the boiler back on. Hold the button for a few seconds until the unit’s display or indicator lights come back to life.

5. Check the Display:

The boiler’s display should show normal operating information, and any error codes or indicators that were previously present should be cleared.

6. Monitor the Operation:

Observe the boiler as it starts up. Listen for normal sounds and watch for any error codes or warning lights that may reappear.

7. If the Reset Fails:

The reset process may vary slightly depending on the specific model. If the reset process doesn’t resolve the issue, refer to your user manual for specific troubleshooting steps. 


What are the most common problems with tankless water heaters?

First and foremost, a significant problem tankless water heater users encounter is slow/inefficient circulation. And you can cure slow circulation by installing the best tankless water heater circulation pump.  A lack of hot water is one of the most common problems with tankless water heaters. Various factors, such as a malfunctioning heating element, a clogged water filter, or a problem with the gas or electric supply, can cause this.

How long do tankless water heaters take to heat up?

Tankless water heaters generally deliver hot water on demand and can heat water in seconds to minutes, depending on flow rate, incoming water temperature, and heater capacity.

Why is my Bosch tankless water heater not igniting?

A Bosch tankless water heater may not ignite owing to gas supply issues, clogged vents, ignition component failure, or insufficient water flow. Check the gas supply, venting, and components for cleanliness. If the problem persists, see an expert for diagnosis and repair.

What is the best tankless water heater for a large home?

The Rinnai RUCS75iN tankless water heater is a strong choice for a large home. It offers a high flow rate and efficiency, suitable for big households. Check Amazon for availability and reviews.