Last updated on February 15th, 2023 at 01:22 am

Are you wondering why your Litter-Robot lights are flashing?

When you’re new to automatic cat litter boxes, it’s easy to get confused when you see your unit’s sensor blinking.

Fortunately, I’m here to explain everything you need to know about Litter-Robot lights.

Just keep reading.

This post contains affiliate links, and I will be compensated if you make a purchase after clicking on my links.

Litter-Robot Lights: What Do They Mean?

An automatic litter box is a great choice when you don’t have enough time to scoop multiple toilet boxes every day or deal with clumps sticking to the bottom of the box.

And Litter-Robot is one of the best automatic toilet boxes you can find because of its smart features, innovative design, and durability.

Orange and white cat peeking out from inside a litter robot

Still, like any electronic device, you’ll need to troubleshoot your unit from time to time. And here’s where it can get confusing with all those blinking lights and sequences.

So, what do your Litter-Robot lights mean?

Well, it depends on the color of the light – blue, red, or yellow – and whether it’s blinking or not.

To help you figure out what’s going on with your machine [1], I’ll talk about what each of these lights means.

#1 Blue Light

The most common light signal you have to deal with when you have a Robot litter box is the blue light. It’s also the easiest to troubleshoot.

A solid blue light means that your unit is ready to use and everything is working as it should. On the other hand, a blinking blue means that the waste drawer is full.

You need to empty the drawer, put a new waste liner in, and press the reset button on the control panel or the Whiskers app.

Afterward, the flashing blue light should return to solid blue light, indicating that the unit is ready.

#2 Yellow Light

A solid yellow light means that your unit is cycling or paused. As such, you don’t have to do anything unless you want to unpause, abort, or pause the cycle:

  • To unpause the unit, press the cycle button
  • To abort the clean cycle, press reset or empty
  • Press any button to put the unit on pause
yellow light under title litter-robot lights

On the other hand, a blinking yellow light signals a problem. How to resolve the issue depends on the flashing sequence:

A slow yellow flashing light (one flash per second)

It indicates that something has interrupted the clean cycle, for example, your cat entering the box or a disconnected globe.

Usually, the unit will start cycling 15 seconds after your feline friend leaves the box and 5 seconds after attaching the bonnet.

  • Rapidly flashing yellow light (four flashes per second) indicates a pinch condition – an obstruction in the waste port.

You need to turn off the Litter-Robot and check the waste port to remove the possible obstruction.

And as one cat owner advises, “If there is no physical cause, it may be the connectors need to be cleaned or corrosion sanded off.” [2]

Check out this video on how to troubleshoot the yellow flashing light.

#3 Red Light

A solid red light shows that the built-in cat sensor has detected your cat inside the unit and is counting down to the start of the clean cycle. So, you don’t have to do anything.

Red light title litter-robot lights

On the other hand, flashing red light means a cat sensor fault, and it has two possible causes:

  • Your cat hasn’t left the unit
  • Excess litter weight

Check if your cat is still inside the globe and ensure you’ve filled the sand to the proper litter level. Then reset the unit and try again.

#4 Yellow and Blue

Solid yellow and blue lights indicate that your device is in an 8-hour sleep mode. As such, the LItter-Robot won’t turn on the clean cycle during these hours.

yellow and blue lights title litter-robot lights

You can turn off the sleep mode by pressing and holding the cycle button or through the Whiskers app.

What Do Flashing Sequences Mean?

Besides single solid or blinking lights, you may notice that your device is flashing several different light colors in a row.

#1 Yellow to Red

Whenever your unit flashes from yellow to red light, it indicates a motor obstruction.

You have to turn off the device, disassemble it, and remove the jam.

#2 Blue to Yellow to Red

This sequence means that your Litter-Robot can’t find the dump position.

You should contact customer service for assistance in resolving the matter.

#3 Red to Yellow to Blue

This sequence means that the unit can’t find the home position. You may have to replace the hall-effect sensor, so you should contact the manufacturer for details.

Check out this video on how to fix the red flashing light.

#4 Blue, Yellow, and Red

If you see blue, yellow, and red blinking simultaneously, the unit has a problem with the cleaning cycle.

According to support, the problem might be related to the base’s wiring or the hall-effect sensor. [3]

Some Reddit users also note that the problem can be related to excess weight, power cord/adapter issues, misaligned Internal Shield.

What To Do When Your Litter-Robot Lights Are Blinking?

So, let’s talk a bit about what you should do when you’re dealing with blinking Litter-Robot lights.

#1 Reset the Unit

As the experienced cat owner Jean Dean says, “Pressing the Reset button may solve a number of issues you might encounter with your Litter-Robot.” [4]

So, before you panic and start reading through forums, you should turn your unit off/on.

#2 Contact Support

Litter-Robot has friendly customer support, so you can give them a call whenever you’re having an issue with blinking lights.

And you can always ask a question in the forum and have customer service resolve it for you or read the troubleshooter.

#3 Change Litter

Sometimes you fill the unit up to the proper litter level, and you still get an error. That’s because some types of clay-clumping litter are heavier than others.

As such, changing the brand can resolve the cat sensor error.

#4 Check the Power Supply

Ensure your adapter meets the unit’s specifications and that the power cord is intact. Change the outlet and try again.

#5 Check the Bonnet/Globe

If the bonnet and the globe aren’t in the proper position, the unit won’t start or finish cycling. Check this video to see how to remove and replace the globe.


Can You Turn the Blue Light Off of the Litter-Robot?

Yes, you can deactivate Litter-Robot’s blue light by pressing and holding the power button for five seconds. If you wish to turn it on, repeat the same action. 

How Do You Fix a Blinking Blue Light on Litter-Robot?

Blinking blue light means that the waste drawer is full, and you should empty it as soon as possible. 

Why is my Litter-Robot flashing all three lights?

Three blinking lights mean that the unit can’t find the Home or Dump position and can’t finish the cleaning cycle. You should contact customer service for more information. 


Litter-Robot is a great choice for cat parents who don’t have much time to scoop the litter box and maintain it clean for multiple cats.

And as you can see, it’s pretty easy to learn what Litter-Robot lights mean so that you can resolve issues as soon as possible.

The litter robot price is well worth it if you can use it, so don’t forget that you also have a trial period, so you can always return the unit in 90 days if it’s too hard to get used to its buttons. 

A cat playing with fairy lights title litter-robot lights

What do you think about this topic? Have you ever had any issues with Litter-Robot lights? Share your user experiences in the comment section. 


  • 1. Is a Self-Cleaning Litter Box Really Less Work?
  • 2. Self Cleaning Automatic Cat Litter Box Australia | Cat Evolution. Self Cleaning Automatic Cat Litter Box Australia | Cat Evolution. Accessed March 23, 2022.
  • 3. Maintenance en cours / Ongoing maintenance. Accessed March 23, 2022.
  • 4. An Honest Litter Robot Review after Owning It for 5 Years – FloppycatsTM. Accessed March 23, 2022.
Olfa T
Olfa T

Olfa knows how to get things done and has a keen business sense that others admire. She’s always on the go, coming up with new ideas! Her ability to anticipate the needs of her readers and deliver information that they want is what makes CatVills such a success. She loves cuddling her cat Picaciu. He is her inspiration.