Litter-Robot 3: Yellow flashing quickly (Pinch sensor)

The Litter-Robot is equipped with an Anti-Pinch safety feature to make the Litter-Robot extra safe for your cat.

While cycling, if a potential pinch condition is detected, the globe will stop and reverse direction for 2 seconds. 

The yellow light will begin flashing quickly, about four times per second.

You will also receive a notification on your phone if you use the Whisker app.


If your Litter-Robot 3 is displaying a yellow light flashing quickly, this indicates a cycle has been interrupted by the Anti-Pinch safety feature and you will need to inspect the pinch sensor.

Inspect the sensors

The purpose of the pinch sensor is to detect if an object is blocking the waste port during the globe rotation.

  1. Press the Power button to turn the unit off.
  2. Unplug the unit from the wall.
  3. Remove the bonnet by pressing the latches on both sides of the bonnet, then lift while rotating it backwards. There are two plastic tabs on the back of the bonnet that should slide up and out of the base.
  4. Set the bonnet aside.
  5. Remove the globe and set aside.
  6. Remove the waste drawer and set aside.
  7. The pinch sensor is located in the base. 
  8. Look at the top of the base, and locate the plastic pinch bar on the left side of the waste port opening.
  9. Press the bar inward several times to dislodge any built-up litter or debris.
  10. Rotate the base so the waste port opening is facing up. 
Locating the two metal pinch detect terminals:
  1. Check pinch terminals for corrosion or debris.
  2. Using a dry cloth or cotton swab, clean any debris from the pinch terminals. The metal should be shiny to ensure a good electrical connection.
  3. Make sure the pinch terminals are touching.
Reassemble the Litter-Robot
  1. Reinstall the waste drawer.
  2. Replace the globe, making sure it is on straight and in its tracks.
  3. Turn the black key into the key pocket at the back of the globe.
  4. Replace the bonnet by inserting the bonnet tabs into the rear bonnet slots, then press the latches while rotating it forward, until the latches click into place.
  5. Plug the Litter-Robot into the wall.
  6. Press the Power button to turn the unit on.

Once the initial clean cycle is complete, the unit should return home displaying a blue 'ready light' status.

Successful: If your unit returned home and displays a solid blue light, you've been successful.

Unsuccessful: If your unit is not displaying a solid blue light after returning to home position, or cannot complete the cycle, your unit needs to be repaired.

Issue not resolved?

To repair your Litter-Robot, you will need a pinch contact & DFI kit or a base.

What do I do?

My unit is covered by WhiskerCare™
If your Litter-Robot is covered by our WhiskerCare™ warranty, you have access to replacement parts, at no cost, to get your Litter-Robot up-and-running quickly.  

  1. Simply log in to your account at
  2. Click on ‘My Robots’ to access the parts available for your robot. 
  3. Select the part you need
  4. We’ll ship you the part at no cost, along with detailed instructions.


The warranty on my unit has expired
If your unit is no longer under warranty, we can help you with the necessary parts and instructions to properly fix your unit at home. 

Parts Needed (choose one): 

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