Navien Error Code 515-09 Abnormal PCB: What It Means and How to Fix It

If you have a Navien tankless water heater or boiler, you may encounter some error codes on the display panel that indicate a problem with the unit. One of these error codes is 515-09, which means there is an abnormality in the main printed circuit board (PCB). This error code can cause the water to heat abnormally or fail to heat altogether. The error code is typically displayed on the control panel, so it’s important to understand what it means and how to resolve it.

In this blog post, we will explain what causes error code 515-09, how to diagnose it, and how to fix it.

What Causes Error Code 515-09?

Error code 515-09 indicates that there is a problem with the PCB, which is responsible for controlling most of the unit’s functions. These include regulating water temperature, controlling water pressure, and activating the system’s safety features. If there is an issue with any one of these components, then the error code 515-09 will appear on your Navien unit’s display panel.

There are several possible causes of error code 515-09, such as:

Faulty or damaged PCB

A damaged or malfunctioning PCB can cause the error code 515-09 to appear. This might be due to a manufacturing defect, power surge, or exposure to moisture.

Improper wiring connections

Loose or incorrect wiring connections can result in abnormal PCB behavior and trigger the error code. This might be due to improper installation, corrosion, or damage.

Electrical interference

External electrical interference from nearby devices or appliances can cause issues with the PCB, leading to error code 515-09. This might be due to electromagnetic fields, radio frequencies, or static electricity.

How to Diagnose Error Code 515-09?

To diagnose error code 515-09, you need to check the PCB and make sure it is properly connected and in good condition. Here are some steps you can follow:

If you are experiencing error code 515-09 on your Navien tankless water heater, there are several steps you can take to troubleshoot the issue. The first step is to turn off the power supply to the unit and unplug it from the outlet.

Next, locate the green PCB (printed circuit board) inside the unit. The PCB is responsible for controlling various components and functions of the unit. Inspect the PCB for any signs of damage or defects, such as burnt components, cracked solder joints, or water damage. If you notice any issues, consider replacing the PCB with a new one or contact a professional technician for assistance.

After checking the PCB, examine the wiring connections between the PCB and other components of the unit. Ensure all connections are secure and free of corrosion or damage. If you notice any issues, consider repairing or replacing the wiring or contact a professional technician for assistance.

Once you have checked the PCB and wiring, plug the unit back into the outlet and turn on the power supply. Check the display panel for any error codes. If error code 515-09 persists, try resetting the unit by pressing and holding the power button for 10 seconds.

If resetting the unit does not solve the problem, contact Navien technical support or a professional technician for further assistance. They can help diagnose the issue and determine if any components need to be repaired or replaced.

Conclusion

Navien error code 515-09 is a common issue that affects Navien tankless water heaters and boilers. It indicates that there is an abnormality in the main printed circuit board (PCB), which can cause the water to heat abnormally or fail to heat altogether. To fix this issue, you need to check the PCB and make sure it is properly connected and in good condition.

If the PCB is faulty or damaged, you need to replace it with a new one that is compatible with your Navien unit. You can either do this yourself or hire a professional technician to do it for you. By following these steps, you can resolve error code 515-09 and enjoy hot water without any interruptions.

FAQs

Q: How do I know if I have error code 515-09?

A: You can check if you have error code 515-09 by looking at the display panel of your Navien unit. If you see the code 515-09 flashing on the screen, it means you have an abnormality in the PCB.

Q: How can I prevent error code 515-09 from happening?

A: You can prevent error code 515-09 from happening by taking some precautions, such as:

• Installing a surge protector to protect your unit from power fluctuations
• Keeping your unit away from sources of moisture or humidity
• Avoiding placing other electrical devices or appliances near your unit
• Following the manufacturer’s instructions for proper installation and maintenance of your unit

Q: How can I reset error code 515-09?

A: You can reset error code 515-09 by pressing and holding the power button for 10 seconds. This will reboot your unit and clear the error code from the display panel. However, this may not solve the underlying problem with the PCB, so you may need to contact Navien technical support or a professional technician for further assistance.

Q: How can I replace the PCB?

A: You can replace the PCB by following these steps:

• Turn off the power supply to the unit and unplug it from the outlet
• Locate and remove the front cover of the unit by unscrewing it from its base
• Locate and remove the PCB inside the unit by disconnecting all wires and screws attached to it
• Install a new PCB by connecting all wires and screws in reverse order
• Replace the front cover of the unit and screw it back to its base
• Plug the unit back into the outlet and turn on the power supply

Q: Where can I get a new PCB?

A: You can get a new PCB from Navien’s official website or authorized dealers. You can also contact MorePCB for a high-quality, reliable alternative that is compatible with your Navien unit. MorePCB is a leading manufacturer of PCBs that offers customized solutions for various applications. You can visit their website at https://morepcb.com/ to learn more about their products and services.