Why My Keurig Slim Descale Light Stays On? – Simple Fixes

Keurig Troubleshooting

Are you staring at your Keurig Slim, wondering why the descale light refuses to go off? You are not alone! Many people face this issue, turning their quick coffee-making experience into a confusing puzzle. But you have nothing to worry about!

In this article, we are going to go through the reasons why the Keurig Slim descale light stays on and give you some simple solutions to get your machine back in top shape.

Why My Keurig Slim Descale Light Stays On?

The descale light on your Keurig Slim is more than just an annoying blinking signal. It is an important reminder.

This light lights up to let you know that it is time to descale your coffee machine. Descaling is crucial for removing calcium deposits, or scale, that can build up over time. These deposits come from the water used in brewing your favorite coffees and teas.

Keurig Slim descale light

Common Causes

  1. The most common reason for the descale light staying on is the accumulation of calcium and minerals in your machine. Hard water contributes to this build-up more rapidly.
  2. Sometimes, the light might persist due to a sensor malfunction, even after you have descaled your machine.
  3. If the descaling process isn’t carried out correctly or is interrupted, the light may continue to stay on.

How To Fix Keurig Slim Descale Light Stays On

Is the descale light on your Keurig Slim refusing to turn off? You might feel a bit frustrated, but there is no need to worry.

Let us walk you through various solutions to fix this common problem.

Perform Standard Descaling

According to the manual, the Descale light will remind you to descale your Keurig every three months.

Follow the standard descale procedure and see whether the Descale light will turn off after that.

Needed Items:

  1. A large mug made of ceramic (avoid using paper cups).
  2. Clean water.
  3. The Keurig® brand descaling solution.
  4. A sink for disposal.

Descaling Steps:

  1. Preparation With Descaling Solution:
    • First, make sure the brewer’s water tank is empty.
    • Pour the entire Keurig® Descaling Solution into the tank.
    • Refill the now empty descaling solution bottle with water and add it to the tank.
    • Confirm there is no coffee pod in the machine.
    • Set a big ceramic mug on the tray where drips fall.
    • To start, turn off the brewer. Then, press the 8oz and 12oz buttons at the same time for 3 seconds. The “DESCALE” light will light up.
    • Hit the brew button once it starts flashing to initiate the cleaning.
    • Dispose of the heated liquid from your mug into the sink.
    • Continue this until the brewer indicates it needs more water.
  2. Cleaning and Resting:
    • Now, clear out the water reservoir and fill it up again to the maximum level with fresh water.
  3. Rinsing with Fresh Water:
    • Activate the brew cycle by pressing the flashing brew button.
    • Keep repeating until you need to add water again.

Once you have done all these steps, your Keurig Slim will no longer be in descaling mode and will be ready for brewing!

NOTE: This process should take around 15-20 minutes.

Restart The Keurig Slim

In most cases, the descale light on your Keurig Slim will stay on because of a glitch in the system. A simple reset can often fix this.

Here is a simple explanation on how to do it properly:

  1. Disconnect your Keurig Slim from the power source.
  2. Leave it unplugged for a few minutes. This wait time allows the machine’s internal system to reset.
  3. Plug the machine back in and run a brew cycle to see if the light turns off.

Check And Clean The Exit Needle

Sometimes, a clogged exit needle can cause sensor issues, leading to the descale light staying on.

Steps To Clean The Exit Needle

  1. Power off and unplug the machine.
  2. The exit needle is where the coffee is dispensed from. If you are not sure where it is take out the part where you put the coffee pod. Take off the funnel from this part. Look for a sharp point (called the exit needle) at the bottom inside part of where the coffee pod goes.
  3. Use a paper clip or a similar tool to remove any debris or coffee grounds from the needle.
  4. After cleaning, run a brew cycle with water only to test if the issue is resolved.

You can also watch this Youtube video for a detailed explanation on how to clean the needles on your Keurig Slim.

Contact Keurig Support

If you have tried the above methods and the descale light stays on on your Keurig Slim, it might be time to contact Keurig support for help.

  • Visit the Keurig website for support options (phone, live chat or email)
  • Use the customer service phone number for direct assistance.
  • Prepare your machine’s model number and describe the issue clearly for efficient help.

Frequently Asked Questions

Why is my Keurig Slim descale light on?

The descale light on your Keurig Slim activates to remind you to descale your coffee maker. This is necessary to remove calcium and mineral buildup caused by water used in brewing. Regular descaling ensures optimal machine performance and great-tasting coffee.

How often should I descale my Keurig Slim?

It is recommended to descale your Keurig Slim every 3 months. However, if you use hard water or use your machine frequently, you may need to descale more often. Watch for the descale light as a timely reminder.

Is it safe to use a descaling solution other than Keurig’s brand?

Yes, it is safe to use third-party descaling solutions as long as they are made for coffee machines. Ensure you follow the manufacturer’s instructions for use to avoid any damage to your Keurig Slim.

Can a persistent descale light indicate a malfunction?

If the descale light stays on after a thorough descaling, it might suggest a sensor issue or another malfunction. In this case, consult the Keurig customer support.


Keeping your Keurig Slim in excellent condition is key to enjoying your daily coffee rituals. Regular descaling is an essential part of this maintenance.

If the Keurig Slim descale light stays on, don’t ignore it. Try the solutions outlined above to fix the issue. Remember, a well-maintained coffee machine means a better-tasting brew!