Litter-Robot 4: Blue and purple alternating light bar (Accessory not detected)

  1. Make sure your unit is plugged in.
  2. Make sure your unit is connected and online.
  3. Make sure your firmware is up-to-date. If the app does not give you the option to update, you have the latest version.


Litter-Robot 4 is equipped with features for future accessories to make life for pets and pet parents endlessly better. If your unit’s light bar is alternating blue and purple, this indicates your unit entered a mode for an accessory that is not detected.



  1. To exit this mode, long press the Cycle and Connect buttons.


Successful: If your unit displays a blue light bar, you've been successful.

Unsuccessful: If you are still seeing a blue and purple alternating light bar, there's likely an issue with your Litter-Robot.

Need Technical Support?
Our Troubleshooting Wizard will solve most issues and is the fastest way to get help.

Troubleshooting Wizard 

Didn't find what you're looking for?

Phone and Chat support available Mon-Fri: 9AM-7PM EST and Sat: 9AM-5PM EST, or submit a ticket anytime.