Instructions for Fixing Errors: Navien Error 515-09

Introduction

Navien is a popular brand of tankless water heaters that are known for their energy efficiency and reliability. However, like any other appliance, Navien water heaters can experience errors and malfunctions. One of the most common errors that Navien users encounter is the 515-09 error. This error code indicates a problem with the water flow sensor, which can cause the heater to shut down. In this article, we will provide you with step-by-step instructions on how to fix the Navien error 515-09.

What Causes Navien Error 515-09?

Before we dive into the instructions for fixing the Navien error 515-09, it’s important to understand what causes this error. The 515-09 error code is triggered when the water flow sensor detects a low flow rate or no flow at all. This can happen due to a variety of reasons, including:

1. Clogged Water Filter

A clogged water filter can restrict the flow of water to the Navien water heater, causing the water flow sensor to detect a low flow rate. This can trigger the 515-09 error code.

2. Air in the Water Lines

If there is air in the water lines, it can cause the water flow sensor to detect a low flow rate, triggering the 515-09 error code.

3. Faulty Water Flow Sensor

In some cases, the water flow sensor itself may be faulty, causing it to detect a low flow rate even when there is adequate water flow. This can also trigger the 515-09 error code.

Instructions for Fixing Navien Error 515-09

Now that you know what causes the Navien error 515-09, let’s take a look at the step-by-step instructions for fixing this error.

Step 1: Check the Water Filter

The first thing you should do when you encounter the Navien error 515-09 is to check the water filter. A clogged water filter can restrict the flow of water to the Navien water heater, causing the water flow sensor to detect a low flow rate. To check the water filter, follow these steps:

1. Turn off the power to the Navien water heater.
2. Locate the water filter on the cold water inlet pipe.
3. Remove the water filter and inspect it for any debris or sediment.
4. If the water filter is clogged, clean or replace it.
5. Reinstall the water filter and turn on the power to the Navien water heater.

Step 2: Bleed the Air from the Water Lines

If the water filter is not clogged, the next step is to bleed the air from the water lines. Air in the water lines can cause the water flow sensor to detect a low flow rate, triggering the 515-09 error code. To bleed the air from the water lines, follow these steps:

1. Turn off the power to the Navien water heater.
2. Locate the bleed valve on the hot water outlet pipe.
3. Open the bleed valve and let the air escape from the water lines.
4. Close the bleed valve once water starts flowing out of it.
5. Turn on the power to the Navien water heater.

Step 3: Replace the Water Flow Sensor

If the water filter is not clogged and there is no air in the water lines, the water flow sensor may be faulty. In this case, you will need to replace the water flow sensor. To replace the water flow sensor, follow these steps:

1. Turn off the power to the Navien water heater.
2. Locate the water flow sensor on the water inlet pipe.
3. Disconnect the wires from the water flow sensor.
4. Remove the water flow sensor from the water inlet pipe.
5. Install the new water flow sensor and reconnect the wires.
6. Turn on the power to the Navien water heater.

Conclusion

The Navien error 515-09 can be frustrating, but it’s usually easy to fix. By following the step-by-step instructions outlined in this article, you should be able to resolve the issue and get your Navien water heater up and running again. If you’re still experiencing problems after trying these solutions, it’s best to contact a professional plumber or Navien technician for assistance.

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