How to fix :error code 515-09 navien ?

Instructions for Fixing Errors Error Code 515-09 Navien


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

What is Error Code 515-09?

Error code 515-09 on Navien tankless water heaters indicates a problem with the water flow sensor. The water flow sensor is responsible for measuring the amount of water flowing through the heater. If the water flow sensor is not working correctly, the heater will not be able to regulate the water temperature, and you may experience issues such as no hot water or fluctuating water temperatures.

Step 1: Turn Off the Power

Before you start working on your Navien tankless water heater, you need to turn off the power. Locate the circuit breaker that controls the power to your water heater and turn it off. This will ensure that you do not get electrocuted while working on your water heater.

Step 2: Check the Water Flow Sensor

The next step is to check the water flow sensor. The water flow sensor is located on the inlet pipe of the water heater. You will need to remove the cover of the water heater to access the water flow sensor. Once you have removed the cover, locate the water flow sensor and check for any signs of damage or corrosion. If the water flow sensor is damaged or corroded, you will need to replace it.

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Step 3: Clean the Water Flow Sensor

If the water flow sensor is not damaged or corroded, you may be able to fix the issue by cleaning it. Use a soft-bristled brush to clean the water flow sensor. Be gentle while cleaning the sensor to avoid damaging it. Once you have cleaned the water flow sensor, reassemble the water heater and turn on the power.

Step 4: Check the Water Pressure

If cleaning the water flow sensor does not fix the issue, you may need to check the water pressure. Low water pressure can cause the water flow sensor to malfunction. Check the water pressure using a pressure gauge. The water pressure should be between 30 and 80 psi. If the water pressure is too low, you may need to adjust the pressure regulator or call a plumber to fix the issue.

Step 5: Call a Professional

If none of the above steps fix the issue, you may need to call a professional. A professional plumber or HVAC technician will be able to diagnose the issue and fix it for you. Do not attempt to fix the issue yourself if you are not comfortable working with water heaters or do not have the necessary skills and tools.


Error code 515-09 on Navien tankless water heaters can be a frustrating issue to deal with. However, by following the above steps, you can fix the issue and get your water heater back up and running. Remember to always turn off the power before working on your water heater and to call a professional if you are not comfortable working with water heaters. With proper maintenance and care, your Navien tankless water heater will provide you with years of reliable service.

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