Error thirteen (13) means your robot is on an obstacle or an uneven surface and a side wheel is stuck. If this is the case, lift your robot 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 wheels 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
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Inspect the front caster wheel on the robot to ensure it is free of any debris
Please visit the iRobot Store - Parts and Accessories or use an authorized retailer to order a part. If you believe you're in warranty, please contact iRobot Customer Care.