Litter-Robot 5 obstruction detected: the real fix
- Empty the drawer and re-liner it — a full drawer or a puffy, stretched liner is the single most common trigger.
- Check the carbon filter cover — a loose cover can rock into a pinch bar as the Globe turns.
- Clear litter and debris — from the dump port and both sides of the chute with compressed air.
- Test the bars directly — press inward on each pinch bar until you hear a soft click to confirm they respond.
- Globe stops and retracts — mid-cycle, the Globe stops turning, backs up briefly, then tries again.
- Blinking Red light — the LED indicator light turns Blinking Red while the Globe retracts and stays that way if the retries fail.
- Whisker app notification — "Obstruction Detected" appears in the app even though nothing looks blocked from the outside.
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 pinch bars are triggering
The obstruction sensors exist to stop the Globe the instant something — including a paw — is in the chute. They're deliberately sensitive, which means everyday litter-box debris trips them far more often than an actual jam.
Something is physically in the chute
A full drawer, clumps piled near the dump port, or an object dropped into the Waste Drawer can contact the dual pinch bars as the Globe rotates. A puffy or stretched liner that isn't pressed flat against the drawer walls does the same thing.
A loose part is rocking into a sensor
The carbon filter cover sits close to one of the pinch bars. If it isn't snapped in flush, normal Globe rotation can knock it just enough to trigger a false obstruction reading — with the drawer completely clear.
Work through the checklist below in order — most Obstruction Detected notifications clear in under 15 minutes without any disassembly.
How to clear the obstruction — step-by-step
Start with the initial checks. Only move to the disassembly steps if the notification is still active afterward.
Test cycle still fails?
Clear leftover litter dust from the port and pinch bars before opening the unit up.
If the issue persists: replacement options
If both pinch bars click normally, the drawer and liner are correctly installed, and the notification still returns on every cycle, this points to a faulty sensor rather than debris. That's a warranty case on a unit this new.
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If Obstruction Detected keeps returning even on an empty, freshly lined drawer, an overloaded or jammed Globe is the next thing to rule out.
Advanced troubleshooting & diagnostics
The Globe stops and retracts but never actually shows Blinking Red
That's expected. The LED only turns Blinking Red while the Globe is actively retracting from a detected obstruction. If the Globe completes a clean cycle right after the retry, the Control Panel returns straight to ready mode — Solid White — and the unit continues in automatic mode with no lasting alert. You only need to act if the LED stays red after the unit gives up on its retries.
Is this the same thing as Overloaded Globe?
They're related but distinct. Obstruction Detected comes from the two pinch bar sensors flanking the Waste Drawer chute — it's about something physically in the path. Overloaded Globe comes from the motor itself stalling under too much resistance, most often excess litter weight above the MAX fill line. Both show the same Blinking Red LED and both start with a stop-and-retract cycle, which is why they're easy to mix up. If clearing the chute doesn't help, check the litter level next — see the Overloaded Globe guide.
Frequently asked questions
Why does my Litter-Robot 5 say Obstruction Detected with an empty drawer?
An empty drawer with the alert still showing usually means a puffy liner edge, a loose carbon filter cover, or leftover litter dust near the pinch bars is triggering the sensor — not the drawer contents. Reinstall the liner flat against the drawer walls and confirm the filter cover snaps in fully.
What are the pinch bars on a Litter-Robot 5?
They're a pair of obstruction detection sensors on each side of the Waste Drawer chute in the base. They monitor for potential pinch conditions at all times as a safety feature, and stop the Globe the instant something contacts them.
Can I clean the pinch bars myself?
Yes. Power off and unplug the unit, remove the bonnet and Globe, then use compressed air to clear debris from around the dump port and both bars, and press inward on each bar to confirm it clicks. No tools or disassembly beyond removing the Globe are required.
Conclusion
Obstruction Detected on a Litter-Robot 5 is almost always cleared by a fresh liner, a reseated carbon filter cover, and a quick pass with compressed air — full disassembly is rarely needed. If you've tested both pinch bars and they still won't clear, let us know what you're seeing and we'll help you figure out the next step.
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 5 bulletin library
Every Litter-Robot 5 bulletin published on the site, in one place:
| Bulletin | Covers |
|---|---|
| TB-LR5-001 | Litter-Robot 5 showing the wrong waste drawer percentage or a false Drawer Full alert?… |
| TB-LR5-002 | Litter-Robot 5 WasteID mixing up urine and feces, cycling too fast, or confusing which… |
| TB-LR5-003 | Whisker says a Litter-Robot 5 Pro firmware update can take 30 minutes and look frozen.… |
| TB-LR5-004 | Litter-Robot 5 won't cycle automatically? Here's every real cause — full drawer, sleep… |
| TB-LR5-006 | Litter-Robot 5 globe stuck with a blinking red light? Fix the Overloaded Globe error —… |
| TB-LR5-007 | Litter-Robot 5 stuck on Globe Position Fault? Here's every documented cause —… |
| TB-LR5-008 | Litter-Robot 5 or Pro flashing red with Safety Bar Disconnect? Clear the pinch bars,… |
| TB-LR5-009 | Litter-Robot 5 stuck on Bonnet Removed even though it's on? Reinstall the bonnet… |
| TB-LR5-010 | Litter-Robot 5 or Pro stuck during WiFi setup? Fix credential errors, Bluetooth… |
| TB-LR5-011 | Litter-Robot 5 stuck on Motion in Drawer and won't cycle? Clear the notification,… |
| TB-LR5-012 | Litter-Robot 5 stuck on Extended Scale Activity for 30+ minutes? Check placement, zero… |
| TB-LR5-013 | Litter-Robot 5 or Pro suddenly offline after working fine? Reconnect automatically,… |
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