Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (2025)

IMPORTANT
  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.


Preparation

Litter-Robot is equipped with anti-pinch sensors on both sides of the waste drawer chute to ensure your cat’s safety while in use. These sensors monitor for potential pinch conditions at all times.

Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (1)

If your unit displays a green and white alternating light bar, this indicates an anti-pinch fault during power up.

Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (2)You will also receive a notification on your phone if you use the Whisker app.

  1. First, let’s check inside the waste drawer to see if there are any foreign objects that could be activating the sensors.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (3)
  2. Now, let's run a test cycle. Short press the Resetbutton, then short press theCyclebutton to run a Clean cycle.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (4)
  3. After the test cycle, Litter-Robot should be in the Home position displaying a blue light bar.
Successful: If your unit displays ablue light bar, you've been successful.

Unsuccessful: If you are still seeing a green and white alternating light bar, please continue.

Troubleshooting

Let’s check for any additional items or debris that might be contacting the anti-pinch sensors.

  1. First, we will remove the bonnet and globe to look for any issues.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (5)
  2. Make sure the unit is in the Home position.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (6)
  3. Press the Power button to turn the unit off, then unplug the unit from the wall.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (7)

Removing the bonnet

  1. To open the bonnet, press and hold the latches on both sides of the bonnet, then lift and rotate the bonnet to its open position.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (8)
  2. Set the bonnet aside.
  3. If you have a fence installed, remove this from the bezel.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (9)

Note: Typically need to remove the bonnet completely only during deep cleaning or bonnet replacement.

Removing the globe

  1. To remove the globe, grab the black handle located on top of the globe, lift the globe out of the base, and set it aside.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (10)
  2. Remove the waste drawer and empty it or set it aside.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (11)

A firm, level surface is required for accurate detection of cats and weight readings.

Inspecting the anti-pinch sensors

The anti-pinch sensors are located at the sides of the dump port within the base. These are active at all times to ensure we can detect any motion within the drawer.

Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (12)

  1. Make sure both pinch bars are free of debris and clean.
  2. Press inward on each of the pinch bars. You should hear an audible click. This ensures the anti-pinch sensors are working properly.

Inspecting the carbon filter

The carbon filter is located on the underside of the globe. If it is not fully seated, it is possible that it may have contacted an anti-pinch sensor during the cycle.

Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (13)

  1. Make sure the filter cover is fully seated and has not popped out during shipping or cleaning.
  2. Check for and remove any obstructions around the waste port hole and in the globe track.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (14)

Now that we’ve checked for any obstructions let’s re-install the globe and bonnet and check for proper operation of the unit.

Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (15)

Installing the globe

  1. To install the globe, hold the globe by the black handle and set it into the base.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (16)
  2. When installing the globe, keep the globe handle and waste port oriented toward the top to ensure the globe is close to the Home position.
  3. The large black gear on the rear of the globe should easily engage with the smaller white drive gear in the base.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (17)

Installing the bonnet

  1. If the bonnet was completely removed, rotate the bonnet upward and align the hinge feature of the bonnet at the back of the base.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (18)
  2. To close the bonnet, rotate the bonnet downward over the globe, applying slight inward pressure at the latches to align the bonnet within the base. You should hear the latches snap into place.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (19)
  3. Check to make sure the center tab at the top of the bonnet is secured in its pocket by pushing down on the bonnet at the tab location.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (20)

Final steps

  1. Reinstall the fence by snapping it onto the bezel at the globe entrance.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (21)
  2. Plug the unit in and power it on.
    Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (22)
  3. The Litter-Robot will then perform a Clean cycle and return to the Home position with a blue light bar.

Successful: If your unit returned home and displays ablue lightbar, you've been successful.

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

Issue not resolved?

To repair your Litter-Robot, you will need a new base.

What do I do?

My unit is covered by WhiskerCare™
If your Litter-Robot is covered by WhiskerCare™ warranty, you have access to replacement parts, at no cost, to get your Litter-Robot up-and-running quickly. Please contact our Customer Experience Team for further assistance.

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.

Part Needed:

  • Litter-Robot 4 Base | Installation Instructions
Need technical support?

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

Troubleshooting Wizard

Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot (2025)

FAQs

Litter-Robot 4: Green & White Alternating Light Bar Guide | Litter-Robot? ›

If your unit displays a green and white alternating light bar, this indicates an anti-pinch fault during power up. You will also receive a notification on your phone if you use the Whisker app.

How to do a hard reset on Litter-Robot 4? ›

Litter-Robot 4: Hard reset

Press and hold the Reset and Connect buttons for 3 seconds, then power the unit on.

How often to change litter in Litter-Robot 4? ›

Change the litter every 2-4 weeks: The frequency of changing the entire litter in the box depends on your unique cat, their bathroom habits, and the type of litter you use. Clumping cat litter usually requires changing every 2-4 weeks while non-clumping litter like pellets may need more frequent changes.

Does Litter-Robot 4 work without WiFi? ›

Litter-Robot 4 requires a 2.4 GHz WiFi signal and IPv4 or IPv6 addressing (5 GHz band not supported). * SmartScale™ technology to record cat weight is most accurate on a firm surface, not carpeting.

What is the green and white light on the Litter-Robot? ›

If your unit displays a green and white alternating light bar, this indicates an anti-pinch fault during power up.

Does Litter-Robot light stay on all the time? ›

The Litter-Robot arrives with the automatic night light function enabled. You can set the light to always on, off, or automatic as well as adjust the brightness of the night light. When the light sensor, located in the control panel, detects low-light conditions, the night light turns on automatically.

How often should I deep clean my Litter-Robot? ›

Cleaning your Litter-Robot

Cleaning or soaking the globe thoroughly every 3 months will help prevent any excess weight from accumulating within the globe. Never submerge, spray, or soak the base or control panel as they contain sensors and electronics.

How often should I fully change my litter? ›

Dr. Elsey's recommends completely changing the litter in your box every 4 weeks if you are using a clumping clay litter. Be sure to remove the clumps daily and top off with fresh litter to maintain a three-inch level. For non-clumping litter, we recommend changing the litter box every 7-10 days.

How often should I scoop my litter box? ›

Scoop waste daily.

This will help ensure it regularly happens. Plus, both you and your cat will be happy the box is always clean.

How much litter to put in Litter-Robot 4? ›

Fill the Globe through the circular opening with clumping litter until it meets the raised MAX Fill Line when spread flat—approximately 8-10 pounds (3.6-4.5 kg) by weight or 1 gallon (4L) by volume. Be careful not to overfill the Globe. The Litter-Robot litter sifting system requires clumping litter to work properly.

Can two cats share a Litter-Robot? ›

We recommend up to 4 indoor cats per single Litter-Robot; however, we do have customers with more cats using a single unit. As a rule of thumb, one cat using Litter-Robot 3 requires that the drawer be emptied once per week; two cats, twice per week; three cats, every other day, and so on.

Can you put a Litter-Robot on carpet? ›

If your Litter-Robot 4 sits on carpet thicker than 3mm(1/8 inch), you can improve the accuracy of SmartScale™ weight readings by placing our specially designed carpet tray between the unit and the floor. Place the carpet tray on the floor in the desired location of your Litter-Robot 4.

How do you reset the weight sensor on a litter robot 4? ›

Press the Reset button to zero the Weight Scale after doing anything that affects the unit's weight, such as adding litter or emptying the Waste Drawer.

How do you clean the cat sensor on a litter robot 4? ›

Cleaning the sensors

With the globe, bonnet, and drawer removed, lean the unit backward so that you can look into the holes on the bezel to see each sensor. Using a clean, dry cotton swab, carefully clean the surface of each sensor to remove any dust.

How do I reconnect my litter robot 4 to wifi? ›

To reconnect your unit, re-enable the connection by pressing the Connect button once to turn the WIFI off, indicated by a white Connect LED. Then, press the Connect button a 2nd time to reestablish the connection. The Connect LED will begin flashing blue again but should change to solid blue after a few seconds.

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