Guide To Fix: Keurig Says Add Water When Full

Owning a Keurig coffee maker, you may have encountered a frustrating issue: Keurig Says Add Water When Full. This perplexing situation can arise due to various reasons, ranging from mechanical malfunctions to simple user errors. In this article, we will guide you through the process of troubleshooting and fixing this perplexing problem, ensuring that your Keurig works flawlessly and allows you to enjoy your favorite cup of coffee without any interruptions.

8 Reasons Why Keurig Keeps Saying Add Water When It’s Full

The Floater In The Water Reservoir Is Stuck

One of the most common causes of Keurig erroneously indicating “add water” is a stuck floater in the water reservoir. The floater is designed to sense the water level and communicate it to the machine’s sensors. If it becomes stuck due to mineral deposits or debris, it may provide inaccurate readings, leading to a false alert.

Use of Unfiltered Water

Using unfiltered or hard water can contribute to mineral build-up and clog the machine’s sensors or valves. This can result in Keurig incorrectly detecting a low water level and initiating the “add water” message, even if the reservoir is full. Therefore, it is recommended to use filtered water to prevent such issues.

Dirt in the Water Reservoir

Another potential reason for Keurig’s misreading is the presence of dirt or debris in the water reservoir. This can obstruct the floaters or interfere with the optical sensors responsible for detecting water levels accurately. Regular cleaning and maintenance should help prevent this problem.

Air Stuck In The Overflow Tube

If air gets trapped in the overflow tube, it can cause false readings and prompt Keurig to add water when it is not necessary. This can happen during the machine’s operation or when refilling the reservoir. Ensuring proper installation and avoiding airlocks can help prevent this issue.

There Is Too Much Air And Dirt In The Tubes

Sometimes, air and dirt can accumulate within the tubes connecting the water reservoir and the machine. This can disrupt the water flow and lead to inaccurate water level readings. Regular cleaning and proper maintenance will minimize the chances of this issue occurring.

Improper Installation of the Water Tank

Poor or incorrect installation of the water tank can cause Keurig to misread the water level. If the tank is not correctly positioned or the floaters are misaligned, the machine may prompt you to add water despite it being full. Ensure that the water tank is securely attached and aligned properly.

Dirt and Mineral Deposits in the Water Tank

Dirt and mineral deposits can accumulate inside the water tank over time, leading to disrupted water level sensing. Regularly cleaning the water tank, especially the floaters and sensors, will prevent such issues and maintain accurate water level detection.

Lack of Enough Water in the Reservoir

While it may seem contradictory, sometimes the Keurig genuinely requires more water than the reservoir appears to hold. This can occur due to variations in the machine’s calibration, preventing it from recognizing the actual water level accurately. In such cases, simply adding additional water to the reservoir may resolve the issue.

Keurig Says Add Water When Full

Easy Solutions to Fix the problem that Keurig keeps saying add water when it’s full 

1. Check and fix the floater in the water reservoir

If your Keurig keeps saying “add water” even when it’s full, the first thing you should do is check the floater in the water reservoir. This floater is responsible for signaling the machine when the water level is low. Make sure it is moving freely and not stuck. If it is stuck, try to gently move it or clean it to ensure it can accurately detect the water level.

2. Avoid using unfiltered water

Using unfiltered water can sometimes cause mineral deposits to build up in the Keurig machine, leading to incorrect water level readings. It is recommended to use filtered water to prevent clogging or other issues that may cause the machine to give false alerts.

3. Clean the water reservoir

Over time, the water reservoir can accumulate build-up and debris, affecting the machine’s ability to accurately detect the water level. Regularly clean the water reservoir by emptying it, giving it a thorough rinse, and ensuring there is no residue or debris left behind. Cleaning will help prevent any false alerts caused by blockages or dirt.

4. Check for air stuck in the overflow tube

Sometimes, air can get trapped in the overflow tube, which may cause the Keurig to incorrectly detect the water level. To fix this issue, try gently tapping or shaking the machine to release any trapped air. You can also try running a brew cycle without a K-Cup to force out any trapped air.

5. Clear any air and dirt trapped in the tubes

In addition to the overflow tube, there may also be air or dirt trapped in other tubes within the Keurig machine. These obstructions can interfere with the correct detection of water levels. To clear them out, gently tap or shake the machine again. You can also try running water through the machine without a K-Cup to help dislodge any trapped air or debris.

6. Ensure proper installation of the water tank

It is crucial to ensure that the water tank is properly installed on the Keurig machine. If it is not fitted correctly, the water level may not be properly detected. Double-check the tank’s alignment and make sure it is securely placed onto the machine.

7. Clean the water tank regularly

To avoid any obstructions or false alerts, it is important to clean the water tank regularly. Empty it, remove any parts that can be disassembled, and clean them thoroughly. Pay attention to any areas where mineral deposits or debris may accumulate. Ensuring the water tank is clean will promote accurate water level readings.

8. Ensure that the water reservoir always has enough water

Finally, it is important to make sure that the water reservoir always has enough water. If the water level drops too low, the Keurig may display the “add water” message even if there is still water present. Monitor the water level regularly and refill as needed to prevent false alerts.

3 Methods to Reset the Water Reservoir on a Keurig

  • Method 1: Power Cycling

The first method is a basic power cycling technique. Start by unplugging your Keurig coffee maker from the power outlet and waiting for a couple of minutes. Then, plug it back in and turn it on. Allow the machine to complete its startup process and see if the “add water” message persists. Power cycling can often resolve minor issues with the machine’s internal sensors and reset the water level detection system.

  • Method 2: Reservoir Removal

Another method to reset the water reservoir is by physically removing it from the Keurig machine. Start by turning off the coffee maker and unplugging it from the power source. Carefully lift the water reservoir from its position, making sure to avoid any spillage. After a few seconds, reposition the reservoir firmly into place, ensuring it is correctly aligned with the machine. Plug the coffee maker back in, turn it on, and check if the “add water” message disappears.

  • Method 3: Contact Keurig Support

If the previous methods fail to resolve the issue, it may be worthwhile to contact Keurig’s customer support. They have a team of dedicated professionals who can provide tailored assistance for specific Keurig models and troubleshoot the “add water” issue further. They might guide you through additional steps or offer a repair or replacement option if necessary.


So, if your Keurig continues to say “add water” despite having a full reservoir, there are several potential causes and solutions to consider. By following the troubleshooting steps outlined in this guide, you’ll be able to diagnose and remedy the issue, ensuring that your Keurig operates smoothly and efficiently.