Keurig K-Supreme Descale Light Won’t Turn Off [Fixed]

Keurig coffee makers are known for their convenience and ease of use. However, like any appliance, they can occasionally experience issues. 

One common problem is the descale light remaining on even after completing the descaling process. 

In this blog post, I’ll explore the reasons behind this issue and provide actionable steps to troubleshoot and resolve it.

Understanding Descaling and Its Importance

Descaling is the process of removing mineral deposits, also known as scale, that accumulate inside your coffee maker over time. 

These deposits can affect the taste of your coffee, reduce the efficiency of your machine, and even cause it to malfunction. 

Regular descaling is essential to maintaining the performance and longevity of your Keurig K-Supreme.

Reasons Why Keurig K-Supreme Descale Light Won’t Turn Off

Keurig K-Supreme Descale Light Won't Turn Off

There could be several reasons why the descale light remains on even after you’ve completed the descaling process:

  1. Incomplete Descaling: The descaling process may not have been thorough enough, leaving some mineral deposits behind.
  2. Faulty Sensor: The sensor that detects scale buildup could be faulty, causing the light to stay on even when there’s no scale present.
  3. Software Glitch: Your Keurig K-Supreme might be experiencing a software issue, preventing the descale light from turning off.

How to Turn off Keurig K-Supreme Descale Light?

Step 1: Perform a Thorough Descaling

Before moving on to more advanced troubleshooting, it’s essential to ensure that you’ve adequately descaled your Keurig K-Supreme. Follow these steps:

  1. Empty the water reservoir and remove the water filter (if you have one installed).
  2. Fill the reservoir with a 50/50 mixture of white vinegar and water.
  3. Run a cleansing brew without inserting a K-Cup, using the largest cup size setting.
  4. Repeat the cleansing brew process until the “Add Water” light comes on.
  5. Let the coffee maker sit for at least 30 minutes with the power on.
  6. Rinse the water reservoir thoroughly and fill it with fresh water.
  7. Run several cleansing brews with fresh water to flush out any remaining vinegar.

If the descale light still doesn’t turn off, move on to the next step.

Step 2: Reset Your Keurig K-Supreme

Sometimes, a simple reset can resolve software glitches that cause the descale light to stay on. To reset your Keurig K-Supreme, follow these steps:

  1. Turn off the coffee maker and unplug it from the wall outlet.
  2. Wait for at least 5 minutes.
  3. Plug the machine back in and turn it on.
  4. Perform another cleansing brew without a K-Cup.

Check if the descale light turns off. If not, proceed to the next step.

Step 3: Check for Sensor Issues

If the descale light remains on after resetting your Keurig K-Supreme, there could be an issue with the sensor that detects scale buildup. To check for sensor issues, try the following:

  1. Locate the sensor inside your coffee maker (refer to your user manual for its exact location).
  2. Inspect the sensor for any visible damage or debris.
  3. Clean the sensor gently with a soft cloth or cotton swab dampened with water.
  4. Dry the sensor with a clean, dry cloth or cotton swab.

After cleaning the sensor, perform another cleansing brew and check if the descale light turns off. If the issue persists, it’s time to contact Keurig customer support.

Step 4: Contact Keurig Customer Support

If none of the above steps resolve the issue, reach out to Keurig customer support for assistance. They can help diagnose the problem and determine if your coffee maker needs repair or replacement.

Preventive Measures to Avoid Future Issues

To minimize the chances of encountering the descale light issue again, follow these preventive measures:

  1. Regular Descaling: Perform descaling every 3-6 months, depending on the hardness of your water and frequency of use.
  2. Use Filtered Water: Using filtered or bottled water can reduce the buildup of mineral deposits in your coffee maker.
  3. Clean Your Coffee Maker Regularly: Regular cleaning of your Keurig K-Supreme, including the sensor and other components, can help prevent issues related to scale buildup.


While it can be frustrating when the descale light on your Keurig K-Supreme won’t turn off, following the troubleshooting steps outlined in this guide should help you resolve the issue. 

Remember that regular maintenance, including descaling and cleaning, is crucial for keeping your coffee maker functioning optimally and providing you with delicious, hassle-free coffee every day.

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