Troubleshooting Your Navien Tankless Water Heater

In this article, we’re giving you a troubleshooting guide for one of the most popular tankless water heater brands – Navien. The Navien tankless water heater is renowned for its simplicity and quality. But, typical to any household appliance, it isn’t without its faults. We’ll give you a guide to understanding and fixing common problems, such as a water flow issue or any other tankless water heater problem, and the resources for fixing unknown issues.

Troubleshooting Your Navien Tankless Water Heater

Troubleshooting Your Navien Tankless Water Heater

The Navien tankless water heater has a few known issues that are frequently experienced by users. Common issues often center around a lack of hot water, poor water flow, the control board, the heat exchanger, and more. In our guide, we’ll show you how to identify these issues and what to do about them.

What is Navien Tankless Water Heater?

A Tankless water heater is a very handy device. Its ability to give you hot water without occupying ample space in your home is extremely useful for many users. And Navien has established a reputation as one of the best in the business, thanks to a high-quality water heater that usually works just as intended. If you notice an issue with your Navien water heater, there is one crucial first step you’ll want to take:

How do I Reset My Navien Tankless Water Heater?

First of all, as is the case with many home appliance issues, it’s often the case that a simple reset will solve your problems. If you encounter an issue with the water heater that you perceive as minor, or you’re seeing an error code on the device that you don’t understand, it’s often the case that a reset will fix the issue, or is at least worth a try.

Unlike some other devices, Navien makes it extremely easy to reset its tankless heater. It might differ slightly depending on the model, but most Navien units have a reset button affixed to the front control panel, which is usually located below the main power button.

Hold the reset button, wait about two minutes, turn the device back on, and see if this has fixed your tankless water heater problem. If not, check out our troubleshooting guide:

Common Issues with Navien Tankless Water Heaters

Flow Sensor Issues: The flow sensor is what monitors your device’s water flow, ensuring the tankless heater is heating the water to the proper temperature. Some users of Navien devices have reported a malfunctioning flow sensor, which is sometimes caused by a rusted or clogged sensor.

If this is your issue, you can attempt to clear the clogging in the flow sensor by loosening the clasp couple holding it in place once the device is turned off. See if there is buildup; if there is, attempt to clear it manually.

Control Board Issues: If you notice your Navien’s control board is malfunctioning (for example, it’s not displaying at all, the device is not properly functioning, etc.) then it is likely the control board that needs to be replaced. Try resetting the device first. If this doesn’t fix the issue, you’ll likely need to have a new control board installed by a professional. Since this is a very technical process, it’s unlikely you’ll be able to handle it by yourself.

Heat Exchange Issues: Your heat exchanger serves a crucial function on your water heater, and allows the heat from the gas to transfer (or “exchange”) to water without coming in direct contact. Issues with the heat exchanger can cause a multitude of issues, including water that doesn’t reach the proper temperature. If you think this might be an issue, you should contact a professional. Because this issue involves potentially hazardous gas, it’s not recommended that you handle it on your own.

Water Isn’t Properly Heating: As mentioned above, a heat exchanger can cause issues with water temperature, but this can happen for many other reasons as well. It might be an issue with the device’s internal thermometer, or it might be that you have improperly set the temperature on your device. Whatever the case, unless you’re an expert in this area, you’ll have difficulty identifying and solving this problem without the help of a professional.

And More: Although these are the most common issues experienced by Navien device users, there are many more possible issues. The best thing to do if you encounter an unknown issue is to call a professional.

Error Codes

In reality, there are many more issues which could potentially affect a Navien water heater, just as is the case with any water heater. Often, you’ll be able to identify the problem based on an error code which may be displayed on the device. You can check out a comprehensive list of error codes here.

Call a Professional

We know, we sound like a broken record at this point. But this is the most important point we will make this article. Many of the issues in this article are highly technical and complex. Even with an error code, you may be unsure how to approach the situation, unless you’re an expert in water heaters. For this reason, you’re advised to contact a professional to address the situation.

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