Litter-Robot EVO position fault: how to fix it
- Check the litter level first — litter above the raised MAX fill line makes the globe heavy and slow — scoop it back down and press Cancel to zero the scale.
- Inspect the globe — power off, unplug, lift out the globe and make sure the magnets in the gear track are all there and seated. Don't unscrew them.
- Clean the base — clear clumps near the dump port, check the seal strips aren't peeling, and confirm the glider buttons are attached.
- Check the motor side — the motor cover must be tight and the drive gear must not wobble. A loose drive gear means a new motor assembly — that's a call to Whisker.
- "Position fault" on the LCD screen — the small display on the EVO shows the words Position fault, and the LED indicator light is blinking red.
- An app alert — if your EVO is connected, the Whisker app sends a Position fault notification.
- The globe stops or won't settle — the globe turns, hesitates, and doesn't come back to rest where it should. Whisker says the fault appears after the robot fails to find or hold the right position three times in a row.
Your cat may have no usable box right now. Cats that can’t get in will hold it or find another spot in the house — put a spare tray down before you start, so nothing depends on how fast this goes.
Why your EVO loses track of the globe
Your EVO doesn't "see" the globe. It counts on small magnets built into the globe's gear track, and a Hall effect sensor in the base that notices each magnet as it passes. If the signal goes missing, or the globe drags so much it arrives late, the robot tries again. After three failed attempts it stops and shows Position fault.
A magnet problem in the gear track
The magnets are the robot's only way of knowing where the globe is. If one is missing, not seated properly, or the gear track itself is cracked or loose, the sensor reads nothing where it expects a signal. Whisker is clear: check that the magnets are present and seated, but don't remove or unscrew them.
Something is dragging on the globe
Clumps stuck near the dump port, seal strips that have started to peel, a missing glider button or a carbon filter cover that has popped off one of its four tabs all add friction. So does litter above the MAX fill line. The globe then turns unevenly and misses its marks.
A loose motor cover or drive gear
If the motor cover isn't fully seated, or the drive gear moves on its shaft, the globe doesn't turn the way the robot commands. A loose drive gear is the one cause you can't fix at home: Whisker's answer is a new motor assembly.
In most homes, the first two parts of the checklist below clear the fault in about 25 minutes, with nothing more than a vacuum and a cloth.
How to fix it, step by step
Work through the steps in order. They follow Whisker's own sequence, with a litter check added first because it's the quickest thing to rule out.
Get the grit out of the dump port and the rim
Debris near the dump port is on Whisker's checklist for this fault. Canned air reaches the corners of the base without taking anything else apart.
If the issue persists: replacement options
If Position fault returns after a clean test cycle, the problem is likely a part: a damaged globe, a failed sensor or a loose drive gear. The EVO launched recently, so most units are still under warranty — contact Whisker first, with your serial number ready: 1-877-250-7729, Monday to Friday 9 AM to 9 PM EST and weekends 9 AM to 5 PM EST, or by ticket at any time. If your unit is out of warranty and the repair quote is high, the EVO bundle below includes the accessories you'd otherwise buy separately.
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Before you get there, the section below covers what to check when the fault keeps coming back.
When the fault keeps coming back
A few patterns point to a specific cause rather than a general clean.
It started right after a deep clean
A fault that shows up right after the globe was washed usually comes from reassembly: the carbon filter cover not clipped on all four tabs, a seal strip lifted by scrubbing, or the globe not sitting fully on its glider buttons. Go back to steps 5 and 7 first.
Position fault, Hall Effect fault or Overloaded globe?
The EVO has three red-light messages that sound alike. Whisker's error list separates them: Position fault means the globe couldn't find or hold its position after three tries. Hall Effect fault means the sensor that detects globe movement failed — check that the globe is installed and turns freely. Overloaded globe means the motor met resistance — check the filter cover and seal strips. If you see Overloaded globe instead, read our EVO Overloaded Globe guide.
| EVO message | What Whisker says it means | First thing to check |
|---|---|---|
| Position fault | Can't find or maintain the correct globe position after three attempts | Reseat the globe; magnets and gear track |
| Hall Effect fault | Globe movement detection failure | Globe installed correctly and turning freely |
| Overloaded globe | Resistance to globe rotation | Filter cover seating and seal strips |
| Motor fault | Motor meeting resistance | Excess litter and blockages |
| Board fault | System board malfunction | Hard reset: hold the Power button for 6 seconds |
Frequently asked questions
What does Position fault mean on a Litter-Robot EVO?
It means the robot could not find or hold the correct globe position after three attempts. The EVO tracks the globe with magnets in the gear track and a Hall effect sensor in the base, so a missing magnet, a loose gear track or anything slowing the globe can trigger it.
Can I remove the magnets to check them?
No. Whisker's instructions say to check that the magnets are present and properly seated, but not to remove or unscrew them. If a magnet is missing or loose, contact Whisker support rather than trying to refit it yourself.
Will too much litter cause a Position fault on the EVO?
It can contribute. Litter above the raised MAX fill line makes the globe heavier and slower to turn. The EVO manual recommends about 0.8 gallons (3 L) of litter, then pressing Cancel to zero the weight sensors after any change.
What if the drive gear is loose?
A loose drive gear can't be tightened back at home. Whisker's fix is a new motor assembly, so contact support with your serial number.
Conclusion
Most EVO position faults come down to something small: a lifted seal strip, a filter cover off one tab, or clumps near the dump port. Work through the checklist once, carefully, before you assume a part has failed. If you've done every step and the fault keeps returning, tell us what you see in the comments — it helps the next owner.
Still not fixed? Here’s what to do next.
Some faults are genuinely hardware, and no amount of cleaning or resetting will clear them. If you’ve worked through everything above and it’s still doing it, stop here rather than taking the unit further apart.
- Go to Whisker (Litter-Robot) directly. If the unit is still under warranty, let them replace the part rather than paying for it yourself — contact Whisker (Litter-Robot) support.
- Tell us what didn’t work. We rewrite bulletins when readers show us a case they don’t cover — compliance@pet-infrastructure.com. Tell us the model, what the lights are doing, and which steps you already tried.
- Ask other owners. r/litterrobot is active and full of people who have had the exact same fault on the exact same model. Search the sub before posting — the answer is often already there.
When to stop and call the manufacturer: if the fix needs the base opened, the motor or control board touched, or any tool beyond a screwdriver — stop. On a unit in this price range, opening it yourself usually voids the warranty, and a warranty repair costs nothing.
Did this actually fix it? 🐾
Related Troubleshooting Guides
Litter-Robot EVO Red Light: What It Means & How to Fix It
Litter-Robot EVO blinking red? It covers 13 different faults — drawer full, drawer removed, jams, and more. Here's how to read each one and clear it fast.
Litter-Robot EVO — Hardware FixLitter-Robot EVO Overloaded Globe Error: How to Fix It
Litter-Robot EVO globe stopping, retracting, and flashing red? That's the Overloaded Globe fault — here's Whisker's full teardown checklist to clear it.
Written by Alberto Guardia
I’m a physician working in medical informatics, and I run Pet Infrastructure on my own — no team, no manufacturer sponsorship, no paid placements. I share my home with Wolfgang, a 13-year-old Chartreux with firm opinions about litter and none whatsoever about firmware.
How this page was put together. Every light code, button sequence and timing here is traced back to Whisker (Litter-Robot)’s own documentation, to official support articles, or to several owner reports that agree with each other — and the guide tells you which. Where something genuinely isn’t documented anywhere, I say so instead of filling the gap.
How I check every guide → · Last updated October 2026