Litter-Robot 3 all lights flashing: position fault fix
- Identify the pattern — two sequential colors keep the unit running in Automatic Mode; all three flashing together stop it from cycling.
- Rule out the simple causes first — excess litter, debris on the Globe, dirty glider buttons, or peeling Base Seal Strips.
- Check the two Globe magnets — near the 1 o'clock (Dump) and 5 o'clock (Home) positions on the gear track.
- Flip a reversed magnet — a magnet installed backward often clears the fault without any new parts.
- Blue, yellow, and red lights flashing — either together at once, or in sequence.
- The unit may still run, or may not — two sequential patterns keep it cycling in Automatic Mode; the simultaneous pattern stops it entirely.
- It looks like a dead electronics board — in most documented cases, it isn't.
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 the three-light code appears
This is the rarest code on the Litter-Robot 3, and the manual's own default instruction for it is simply to contact support — but Whisker's web support goes further with an actual DIY check.
Two magnets track the Globe
The Litter-Robot 3 uses two magnets located in the Globe's gear track to monitor its position — one near the 1 o'clock position for Dump, one near 5 o'clock for Home — read by a position sensor mounted in the control panel opening. If either magnet goes missing, shifts, or gets installed reversed, the sensor can't confirm where the Globe is.
Drag and obstruction first
Before a magnet is even the suspect: excess litter (over 10 lbs), clumps or a toy blocking rotation, debris on the Globe exterior or in the Waste Port, damaged glider buttons, or peeling Base Seal Strips can all produce the same symptom by preventing the Globe from reaching its tracked positions.
In most cases, the steps below identify the cause in about 20 minutes.
How to check the globe magnets
Work through these in order — most owners find the answer at step 1 or the magnet check in Part B.
Ready to check the magnets?
Opening the Globe to reach the magnets means removing 10 screws — a precision screwdriver set makes it a clean job instead of a search for the right bit.
If the issue persists: replacement options
If both magnets are present and correctly oriented but the fault keeps coming back, the position sensor itself is the next suspect rather than the magnets. The tools below cover the two jobs this fix actually needs: opening the Globe, and any related gear checks.
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If the fault persists after checking both magnets, it's worth also confirming the unit is getting reliable power — an intermittent power supply is one of the causes Whisker lists for this same code, alongside a damaged position sensor.
Advanced: the position sensor
What if the magnets check out fine?
The position sensor itself sits behind a 6-wire connector in the control panel opening (yellow wires on the left, orange wires on the right). A damaged or misaligned sensor produces the same three codes even with both magnets correctly in place. Replacing it is a WhiskerCare-level repair rather than a DIY job.
It's also worth confirming the unit isn't a separate power problem wearing this code as a symptom — a base that's losing power intermittently during a cycle can produce the same lost-position fault, which is a different repair path from a magnet or sensor issue.
Frequently asked questions
What does it mean when all three lights flash on my Litter-Robot 3?
The unit has lost track of the Globe's physical position. Two sequential color patterns let it keep running in Automatic Mode; all three flashing together means it has stopped cycling entirely until the fault is cleared.
Can I fix a Litter-Robot 3 position sensor fault myself?
Often, yes — most documented cases trace back to one of the two Globe magnets being reversed or dislodged, which you can check and correct with a household magnet and a screwdriver in about 20 minutes.
Where are the globe magnets on a Litter-Robot 3?
They sit inside the Globe's gear track, one near the 1 o'clock position (Dump) and one near 5 o'clock (Home), read by a position sensor mounted in the control panel opening.
Does my Litter-Robot 3 still work if it flashes blue-yellow-red or red-yellow-blue (not all at once)?
Yes — those two sequential patterns flag a missing Dump or Home position but let the unit continue running in Automatic Mode. Only all three lights flashing simultaneously stops the unit from cycling.
Conclusion
This code looks like a dead unit, but in most documented cases it's a magnet that shifted or flipped inside the Globe track — a 20-minute DIY check before assuming the position sensor or base needs replacing.
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-LR3-004 | 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-LR3-006 | Litter-Robot 3 stuck on a solid yellow light with the globe not turning? It's usually… |
| 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