Navien 515-09 Error Code: How to Fix Abnormal PCB Error [2025]

Navien tankless water heaters are praised for their energy efficiency and durability. However, like any appliance, they can develop issues over time. One common problem is the Navien 515-09 error code, which signals an abnormal PCB (printed circuit board) error. In this guide, we’ll explain the causes of this error and provide step-by-step instructions to troubleshoot and resolve it.

Navien 515-09 Error Code: Overview

When your Navien water heater displays error code 515-09, it means that there is an issue with the PCB board. This can be caused by a range of factors, such as power surges, wiring problems, or simply wear and tear over time. The good news is that this error is usually fixable, and you can often resolve it yourself without needing to call in a professional.

Reddit Solutions

According to Reddit users who have experienced this error, there are several steps you can take to fix it. Here’s a summary of the most common solutions:

• Check the wiring connections: Ensure that all the wiring connections to the PCB board are secure and not loose. This is the most common cause of this error.
• Clean the water filter: A clogged water filter can also cause this error. Turn off the power to the unit, remove the filter, and clean it thoroughly before reinstalling.
• Check the fan motor: In some cases, a faulty fan motor can cause this error. Check the motor to ensure that it’s working correctly.
• Replace the PCB board: If none of the above solutions works, you may need to replace the PCB board. This is a more complex solution and may require professional assistance.

Steps To Fix Navien 515-09 Error Code

Now that you have an overview of the solutions to this error, let’s get to the step-by-step guide to fixing it.

Step 1: Turn off the power to the unit

Before you begin any troubleshooting, ensure that the power to the Navien water heater is turned off. This will help prevent any accidents or further damage to the unit.

Step 2: Check the wiring connections

The first step in troubleshooting this error is to check the wiring connections to the PCB board. Start by removing the front cover of the unit and locating the PCB board. Check all the wiring connections to ensure that they’re secure and not loose. If you find any loose connections, tighten them using a screwdriver.

Step 3: Clean the water filter

If the wiring connections are all secure, the next step is to check the water filter. Turn off the water supply to the unit, and then turn off the power. Locate the water filter and remove it from the unit. Clean it thoroughly using a soft brush or cloth, and then reinstall it.

Step 4: Check the fan motor

If the above solutions don’t work, the next step is to check the fan motor. This is located near the PCB board. Check the motor to ensure that it’s running smoothly and not making any strange noises. If the motor is faulty, you may need to replace it.

Step 5: Replace the PCB board

If none of the above solutions works, the last resort is to replace the PCB board. This is a more complex solution and may require professional assistance. Contact a qualified technician or Navien customer service for assistance.

How to Troubleshoot Navien 515-09 Error Code

If you’re experiencing Navien 515-09 error code, don’t worry. You can troubleshoot and fix the issue by following some simple steps. Here are the solutions to help you troubleshoot and fix Navien 515-09 error code:

Check the PCB Connection

The first thing you should do when you encounter Navien 515-09 error code is to check the PCB connection. Sometimes, loose or damaged connections between the PCB and other components can cause this error code to appear. To check the connection, follow these steps:

• Step 1: Turn off the water heater and disconnect the power supply.
• Step 2: Open the front cover of the unit and locate the PCB.
• Step 3: Check all the connections between the PCB and other components such as the igniter, flame rod, and sensors.
• Step 4: If you notice any loose or damaged connections, try to reconnect them or replace them if necessary.

Check the PCB

If checking the connections doesn’t resolve the issue, the next step is to inspect the PCB. Overheating or physical damage to the PCB may be the cause.

In summary, the Navien 515-09 error code is a serious problem that requires immediate attention. It indicates an issue with the printed circuit board (PCB) and can lead to a complete system shutdown. If this error occurs, take prompt steps to troubleshoot it.

Conclusion

This article has outlined several solutions for the Navien 515-09 error code, with detailed instructions for each step. By following these steps, you should be able to fix the issue and get your Navien tankless water heater working again quickly.

If these solutions don’t work, it’s best to contact a certified Navien technician to diagnose and repair the problem. Attempting to fix it without proper knowledge can be dangerous and may cause further damage to your system.

We hope this guide has helped resolve your Navien 515-09 error code. Feel free to share your feedback in the comments below.

Frequently Asked Questions

What does Navien 515-09 error code mean?

Navien 515-09 error code indicates an abnormal PCB error. This means that there is an issue with the printed circuit board, which controls the unit’s functions. Navien 515-09 error code: How to Troubleshoot and Fix It

Why Am I Getting Navien 515-09 Error Code?

Several factors can cause Navien 515-09 error code to appear on your tankless water heater’s digital display. Some of the most common causes of this error code include:

• Power surge or outage
• Loose or damaged PCB connections
• Faulty PCB
• Overheating or malfunctioning parts
• Wiring issues