Error three (3) means your Roomba® j Series or Combo 10 Max robot is on an obstacle or an uneven surface and the Right Wheel is stuck. If this is the case, lift your Roomba® off the floor, place it in the center of the room, and restart the clean cycle. If this error occurred on a flat surface, check the Right Wheel for obstructions.
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Push the wheels up and down several times and shake out any loose debris that may be trapped in the wheel well
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Briskly turn both wheels by hand and make sure they turn freely and that each wheel exhibits the same amount of resistance
If the issue persists, you may need a new Right Wheel Module. Please visit the iRobot Store - Parts and Accessories or use an authorized retailer to order a part. If you believe you're in warranty, If you believe you're in warranty, please contact iRobot Customer Care.