the lidar cover on top keeps spinning but the robot isn't moving, then it errors out.

Diagnosis

The Samsung Bespoke Jet Bot Combo AI relies on a Laser Distance Sensor (LiDAR) that rotates at high speeds to map the room. When the LiDAR cover spins but the robot remains stationary before throwing an error (typically "Laser Sensor Error" or a red light blinking on the chassis), it indicates a "stalled motor" state. This happens when the internal spinning mechanism encounters physical resistance, causing the motor to draw too much current, which triggers a safety shutdown to prevent the motor from burning out. The root cause is almost always a foreign object—typically a strand of long hair, a piece of clear fishing line, or a thick dust bunny—that has bypassed the outer casing and wound itself around the spindle. Because the LiDAR is an optical system, even a tiny piece of debris can obstruct the laser's path or create enough friction to slow the RPMs below the required threshold. You can confirm this by listening closely: if you hear a rhythmic clicking or a high-pitched grinding sound before the error occurs, the spindle is physically obstructed.

How to Fix It

To resolve the LiDAR stall, you must perform a manual clearance of the optical assembly. Follow these precise steps:

1. Power down the unit completely by pressing the Power button on the top of the robot and ensuring it is not docked in the Clean Station.
2. Locate the clear plastic LiDAR turret on the top of the device. Grip the outer ring of the cover firmly.
3. Rotate the cover counter-clockwise approximately 15 degrees. You will feel a slight click as the locking tabs disengage. Lift the cover straight up and away from the chassis.
4. Inspect the central silver spindle. Use a pair of fine-tipped tweezers or a needle to pluck out any hair or thread wrapped around the base of the rotating shaft. Do not pull forcefully, as you may bend the sensor arm.
5. Using a can of compressed air, blow short bursts of air around the base of the spindle to clear out microscopic dust particles that may be causing friction.
6. Manually flick the spindle with your finger to ensure it spins freely for several seconds without stopping abruptly.
7. Reinstall the cover by placing it centered over the spindle and rotating it clockwise until you hear a distinct click, locking it back into place.
8. Restart the robot and initiate a "SmartThings" map update to recalibrate the sensor.

If That Didn't Work

• Hard Reset the Logic Board: If the sensor is clean but the error persists, the system may be stuck in a software loop. Hold the Power and Home buttons simultaneously for 10 seconds while the robot is off the dock. This clears the volatile memory and forces the LiDAR to re-initialize its startup sequence.
• Check for Drive Wheel Obstructions: The robot may be timing out because it thinks it is moving (due to the LiDAR spinning) but the wheels are physically jammed. Flip the robot over and inspect the two main drive wheels. Use a pair of scissors to cut any hair wrapped around the axle of the wheels, which can cause the robot to "slip" and trigger a navigation error.
• Clean the Optical Window: Use a dry, lint-free microfiber cloth to wipe the inside of the clear LiDAR cover. If there is a smudge or a fingerprint on the plastic, the laser may reflect back into the sensor, causing the robot to believe it is touching a wall when it is actually in open space, leading to a "stuck" state.
• Check for Infrared Interference: Ensure there are no high-intensity infrared heat lamps or direct, blinding sunlight hitting the LiDAR turret. Strong IR signals can "blind" the sensor, causing it to spin indefinitely while searching for a return signal, eventually timing out into an error state.

Heads Up

• Avoid Chemical Cleaners: Never use Windex, alcohol, or wet wipes on the LiDAR spindle or the interior of the cover. These chemicals can strip the anti-reflective coating off the laser lens, permanently degrading the mapping accuracy.
• Pet Hair Maintenance: If you have long-haired pets, check the LiDAR cover once every two weeks. Hair can migrate into the turret through the small gaps in the casing, leading to motor failure if left unaddressed.
• Avoid Manual Forcing: Never attempt to force the LiDAR spindle to rotate manually with a tool. The internal gears are precision-molded plastic and can snap easily, which requires a full sensor assembly replacement.