Litter-Robot 3 solid yellow light with no globe movement
- Press Cycle once — rules out a simple pause — the most likely cause.
- Check the gear track alignment — the large gear around the Globe needs to sit properly in the Base track.
- Wiggle the black spur gear — behind the control panel — if it spins freely, its set screw has backed out.
- Tighten the set screw — clockwise with a 3mm hex wrench, then confirm the gear no longer moves by hand.
- Solid (not flashing) yellow light — the panel shows the normal "Cycling / In Use" color.
- But the Globe isn't actually turning — no rotation, no sound of the motor engaging.
- It happens right after your cat exits — at the point where the Clean cycle should be starting.
Your cat can still use the box, but cycles aren’t reliable. Scoop once by hand today so waste doesn’t sit in the globe overnight.
Why solid yellow with no movement isn't in the manual
This symptom trips people up because it isn't in the base manual's light-code table at all — Whisker documents it only through a dedicated web support article.
A paused cycle
Pressing any button during a Clean cycle pauses it — which can happen by accident. The unit sits on a solid yellow light exactly as if it were cycling normally, but nothing moves until you press Cycle again to resume.
A loose gear on the motor shaft
The exposed black spur gear behind the control panel can come loose if its set screw backs out over time. The motor still runs and the panel still shows solid yellow, but the gear spins without turning the Globe with it.
In most cases, the steps below resolve this in about 15 minutes.
How to fix it
Work through these in order — most owners find the cause at step 1 or the gear check in Part B.
Ready to check the gear?
Tightening the set screw takes a 3mm hex wrench — this set covers that size plus everything else you'll need across the LR3.
If the issue persists: replacement options
If the gear was already tight and the motor still doesn't turn at all, the next step is testing whether the base is getting reliable power before assuming the motor has failed.
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If neither the gear nor the power supply resolves it, the motor itself likely needs a WhiskerCare-level repair.
Advanced: ruling out the motor or power supply
Does a loose gear mean I need a new motor?
No — a loose gear is a set screw problem, not a motor problem. The motor itself is still spinning fine; it's just not transferring that rotation to the Globe anymore. Tightening the set screw restores the connection without touching the motor at all.
If tightening the gear doesn't help and the motor doesn't respond at all — no sound, no movement, nothing — that's a different symptom worth testing against a completely unresponsive unit rather than this one. A unit that shows no lights whatsoever, not even a solid yellow, usually points to a power delivery problem rather than the motor itself, and is worth checking with a known-good outlet and a fresh power supply before assuming the base has failed.
Frequently asked questions
Why is my Litter-Robot 3 stuck on a solid yellow light?
Usually one of two things: the cycle is simply paused (press Cycle to resume), or the black spur gear behind the control panel has come loose on the motor shaft, so the motor spins without turning the Globe.
How do I tighten a loose gear on my Litter-Robot 3?
Remove the Bonnet and Globe, wiggle the exposed black gear to confirm it spins freely, then tighten its set screw clockwise with a 3mm hex wrench until the gear no longer moves by hand.
Is a solid yellow light the same as a flashing yellow light on the Litter-Robot 3?
No. Solid yellow means "Cycling / In Use" — normal during a cycle, or a symptom of this fault if the Globe isn't actually moving. A flashing yellow light is a different, separate signal covered in our dedicated guide on that code.
Does a loose gear mean I need a new motor for my Litter-Robot 3?
No. The motor is usually working fine — it's the gear's grip on the motor shaft that has failed. Tightening the set screw with a 3mm hex wrench resolves it without replacing anything.
Conclusion
A solid yellow light with a motionless Globe is very rarely a dead motor — check for a simple pause first, then a loose gear, before assuming you need a replacement part.
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? 🐾
The complete Litter-Robot 3 bulletin library
Every Litter-Robot 3 bulletin published on the site, in one place:
| Bulletin | Covers |
|---|---|
| TB-LR3-001 | Litter-Robot 3 stuck with a red flashing light? It means the Cat Sensor has been… |
| TB-LR3-002 | Litter-Robot 3 flashing yellow-red or blue-red? That's a motor jam or overload. Here's… |
| TB-LR3-003 | Litter-Robot 3 stuck with all three lights flashing? It can't find Home or Dump… |
| TB-LR3-004 | Litter-Robot 3 blue light flashing even with an empty waste drawer? The DFI sensor is… |
| TB-LR3-005 | Litter-Robot 3 yellow light flashing mid-cycle? A slow flash means the cycle was… |
| TB-LR3-007 | Litter-Robot 3 completely dead, no lights at all? Before assuming the base is fried,… |
| TB-LR3-008 | Litter-Robot 3 waste sticking to the globe liner or the unit getting stuck mid-cycle?… |
| TB-LR3-009 | Litter-Robot 3 Connect stuck offline or failing app setup? Here's how the Wi-Fi… |
| TB-LR3-010 | Litter-Robot 3 acting up? Match your exact light color or pattern to the right fix —… |
| TB-LR3-011 | Every Litter-Robot 3 replacement part, from the $5 pinch contact to the $349 base, and… |
| TB-LR3-012 | The Litter-Robot 3 Pinch Contact and DFI Kit is $30 and holds four parts. What's… |
| TB-LR3-013 | Pinch contact, anti-pinch pins, LR3PINCH, LR34009 — one $5 part under five names, and… |
| TB-LR3-014 | Litter-Robot 3 globe not moving at all? The motor assembly is $48 and takes about 25… |
| TB-LR3-015 | Litter still sticking to the Litter-Robot 3 globe liner? Four causes, how to tell them… |
| TB-LR3-016 | A Litter-Robot 3 Connect that won't finish onboarding is either settings or hardware.… |
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 August 2026