the robot keeps getting stuck under my kitchen chairs or cabinet overhang, how do i stop it?

Diagnosis

The iRobot Roomba Combo j9+ utilizes a sophisticated sensor array and a high-profile chassis designed to accommodate the retractable auto-wash mop system. The primary cause of "getting stuck" under kitchen chairs or cabinet toe-kicks is a phenomenon known as "wedge-locking." Because the j9+ has a slightly tapered front profile but a bulkier rear section (housing the vacuum motor and the lift mechanism for the mop), it can glide under a piece of furniture that is 4 to 5 inches high, only to have the rear chassis snag on the underside of the furniture as it attempts to turn or reverse. This typically happens when the robot enters a "trap" area where the clearance is just barely above its operational height. Once the rear of the unit makes contact with the underside of a cabinet or chair rail, the drive wheels lose the necessary traction to push the robot backward, or the robot's internal IMU (Inertial Measurement Unit) detects a tilt that triggers a "stuck" error. You can confirm this is the issue if the robot consistently reports "Robot is stuck near [Room Name]" and you find it wedged nose-first under a surface with a clearance of less than 5.5 inches.

How to Fix It

To permanently resolve this, you must utilize the Precision Mapping features within the iRobot Home App to create digital barriers. Follow these exact steps:

1. Open the iRobot Home App and ensure your j9+ has completed at least one full "Mapping Run" so a Smart Map is generated.
2. From the home screen, tap the Map icon to enter the map editor.
3. Select the Keep Out Zones tool from the bottom menu.
4. Carefully draw a rectangular zone over the specific area where the kitchen chairs are located. For a standard set of 4 chairs, create one large zone encompassing the entire dining area or four small individual zones around the chair legs.
5. For cabinet overhangs (toe-kicks), draw a thin, linear Keep Out Zone exactly along the edge of the cabinetry. Ensure the zone extends roughly 2-3 inches beyond the physical edge of the cabinet to account for the robot's turning radius.
6. Tap Save and then run a "Clean" command for that specific room to verify the robot treats the zone as a physical wall.

If That Didn't Work

• Physical Blocking: If the robot is ignoring the digital zones due to a mapping drift, use physical barriers. Placing a clear acrylic "furniture riser" or a small piece of white cardboard under the chair legs can either lift the chair high enough for the j9+ to clear it entirely or create a visible obstacle that the robot's front-facing cameras will detect and avoid.
• Adjusting the "Clean" Schedule: If the robot only gets stuck during "Deep Clean" modes where it uses more aggressive scrubbing patterns, switch the kitchen area to "Vacuum Only" mode. This reduces the robot's tendency to pivot sharply in tight spaces, which is often when the rear chassis catches on cabinet lips.
• Updating Firmware: Check the Device Settings > Software Update menu. iRobot frequently releases "Obstacle Avoidance" patches that improve how the j9+ interprets the height of furniture via its front-facing camera. Ensure you are on the latest version to maximize the efficacy of the onboard AI.
• Resetting the Smart Map: If the robot is drifting into Keep Out Zones, the map may be corrupted. Delete the current map, move all chairs out of the room, and run a new "Mapping Run." Once the map is clean and accurate, re-draw your Keep Out Zones.

Heads Up

• Avoid using "Virtual Wall" barcodes on high-gloss kitchen floors; the j9+'s optical sensors can sometimes struggle with glare, making digital Keep Out Zones far more reliable.
• Regularly clean the front-facing camera lens with a dry microfiber cloth; dust buildup on the lens can lead to "blind spots" that cause the robot to misjudge the height of cabinet overhangs.
• Be aware that if you move your kitchen chairs, the Keep Out Zones will remain in the old position, potentially leaving the robot vulnerable to getting stuck in the new location.
• If the robot is consistently wedged under a specific cabinet, check for loose trim or "sagging" toe-kicks that may have dropped below the 5-inch clearance threshold over time.