Whisker Litter-Robot 4 replacement parts

On the Litter-Robot 4 the only parts you buy on a schedule are the carbon filter (Whisker says monthly) and the waste drawer liners (about one a week for one cat), which come to roughly $355 over 3 years at full price. Seal strips, the globe liner, the laser board and the power supply are only replaced when worn or faulty. If your unit is still under the WhiskerCare warranty, Whisker sends many of these parts free through Replacement Parts in your account, so check that before you pay.

UPDATED OCT 16, 2026 · PRICES FROM MAKER STORES

Parts cost over 3 years$355For the 2 parts with a published replacement interval. The 3 year total covers carbon filters and 25 pack liners for one cat at full price; it leaves out optional OdorTrap packs, Autoship discounts and parts replaced only when worn.

Part	Pack	Price	Replace	3 yr cost	Buy
Carbon filters LR4-6000-6PK Litter-Robot 4 only. Whisker says the unit works without a filter, and Autoship takes 30% off.	6 pack	$30	Every month (maker guidance)	$180	Whisker US store Amazon →
Waste drawer liners Fits Litter-Robot 2, 3, 4, EVO and 5. Also sold as a 10 pack for $12 and a 50 pack for $35, which lowers the yearly cost.	25 pack	$25	Each time you empty the drawer, about once a week for one cat or twice a week for two (maker guidance)	$175	Whisker US store Amazon →
OdorTrap packs (optional) Sale price seen 2026-10-16, regular $30. Whisker pitches these as an alternative to the carbon filter, so they are left out of the total; at this price 3 years of packs would run about $252.	6 pack	$21	Every 2 weeks (maker guidance)	n/a	Whisker US store Amazon →
Seal strips pack LR4-9049 Covers every strip type on the lower globe, bezel and waste port. A separate upper waste port strip set sells for $10.	12 strips	$29	When dirty or peeling, or when odor or litter leaks increase (no maker interval)	n/a	Whisker US store Amazon →
Globe liner LR4-9016 Litter-Robot 4 only. Needs a Phillips and a flathead screwdriver to install.	1 liner	$70	When worn or damaged (no maker interval)	n/a	Whisker US store Amazon →
Laser board LR4-LASER Drives the curtain and OmniSense sensors. Whisker lists it for red or flashing blue (DFI) light bar faults that cleaning does not fix. For serial numbers starting LR4S or LR4C.	1 board	$50	When sensor faults remain after troubleshooting (no maker interval)	n/a	Whisker US store Amazon →
Power supply LR4-PS-US 15 volt DC adapter with a 70 inch cord, for US and Canada outlets.	1 adapter	$35	When it fails (no maker interval)	n/a	Whisker US store Amazon →
Step mat LR4-1328 Black rubber mat on the step that catches tracked litter. Litter-Robot 4 only.	1 mat	$30	When worn (no maker interval)	n/a	Whisker US store Amazon →

Check the part number against your model before you order. Third party parts are cheaper but can void the warranty. Amazon links are affiliate links.

Tips to make parts last

Change the liner every time you empty the drawer; Whisker says that is about once a week for one cat and twice a week for two.
If your Litter-Robot 4 is under the WhiskerCare warranty, log in and use Replacement Parts before buying a globe liner, laser board or power supply, since Whisker supplies covered parts at no cost.
Rising odor usually points to the seal strips around the upper and lower waste port, while litter leaks point to the strips on the lower front of the globe and the bezel, per Whisker's seal strip page.
A flashing blue light bar is Whisker's drawer full indicator (DFI) sensor alert; work through the support steps and firmware check before ordering a new laser board.
Autoship takes 30% off filters, liners and OdorTrap packs, which cuts the 3 year running cost noticeably.

Questions owners ask

How often should I change the Litter-Robot 4 carbon filter?

Whisker recommends a new carbon filter every month, so a $30 six pack lasts half a year. Homes with several cats may need to change it sooner.

Do I have to use Whisker brand liners?

Whisker sells custom fitted liners that fit the Litter-Robot 2, 3, 4, EVO and 5 drawers, in 10, 25 and 50 packs. The 50 pack at $35 is the cheapest per bag.

Is the OdorTrap pack required?

No. OdorTrap packs are optional, and Whisker presents them as an alternative to the carbon filter. If you use them, Whisker says to replace a pack every 2 weeks.

Which part fixes a flashing blue light on the Litter-Robot 4?

Flashing blue points to the drawer full indicator (DFI) sensors. Whisker lists the $50 laser board as the likely fix only after the troubleshooting steps have not cleared the fault.