As with all vacuum cleaners, the unit can get dirty inside. There is a sensor under the brush unit that hears dirt hit it and triggers the circular cleaning action. This sensor looks like a dime sized hole with a bronze piece inside. Also the unit can be disassembled by removing 4 screws on the bottom and removing the top.
Testimonial: "That was perfect. After taking off the bottom cover, cleaning the debris from inside, the unit started up perfectly. Thanks!"
SOURCE: irobot 4100 brushes do not turn & bin is empty
Yes, it probably needs a new cleaning head module, if your bearings are clean and the brushes still don't turn.
SOURCE: My Irobot Roomba keeps saying that I need to clean
Perform the troubleshooting found at the iRobot website: http://tinyurl.com/nh5c8a (I promise that really does go to the right site.) That troubleshooting will enable you to determine exactly what's causing this problem. (The Easy Way: Run the Roomba minus the dustbin and look in the back. Is the brush turning? If not, there's the problem. Give support a call at 1-877-855-8593 and they'll let you know how to replace the necessary part.)
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