My Rooma Discovery 4210 has one slow-moving wheel--one of the two spins just find, the other slowly. I can't find an obstruction, but I can't see what might be lurking between the wheel and the black plastic that covers it, either. I called and Roomba told me the wheels of the Discovery models can't be fixed and suggested I buy a new Rooma 500-series, which has fixable wheels. They didn't recommend trying to repair the wheel. Well. Thanks, Roomba. Given that this machine is otherwise useless, any suggestions on how to get that wheel unstuck?
I had a similar problem, I just took my Roomba Red apart and put it back together about four times before I fixed it. In my case it turned out to be a dirty sensor, fixed as described at
Before you open it up I recommend following the diagnostic tests to see if its a physical problem (bad motor belt, hair stuck around the wheel) or a sensor problem (dirt makes Roomba think it is stuck when it isn't). If you follow the diagnostics one of them will move the Roomba wheels while ignoring the sensors; if the wheels move fine then you probably have a sensor problem.
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Try cleaning the silver contacts on the battery as well as the charging station with a small amount of rubbing alcohol such as an alcohol pad.
Also check to make sure the dirt reserve is completely empty. Also check that the briushes are clear and can move freely.
This 'not charging' is a very common problem with the Roomba and the manufacturers continue to sell rechargable batteries that are no good even though they are aware of the problem.
I don't have the same roomba that you have, but I had a lot of dog/cat hair stuck on the fan in the trash bin section. Once I removed that it started to work again. I used an air compressor to give it a really good blow out. Here is a link that might help you out. http://www.robotreviews.com/chat/viewtopic.php?f=1&t=10960
I had this problem with my Roomba Discovery. I ran across your question while searching for an answer. My main symptoms were, Roomba hesitated a lot, and the dust bin did not fill. I had plenty of hair wrapped around the brushes and against the filter.
I just finished taking my Roomba apart. I found the motor drive shaft had a LOT of hair wrapped around it and it had climkbed into my gearbox. I took that apart and cleaned all the hair out of the gearbox. My Roomba is back to normal now, filling the dust bin.
My status light came on, the vac beeped twice and stopped. I noticed my brushes weren't spinning. I took an eyeglass screwdriver and took off the center screw that holds on the brushes. I cleaned the shaft that the brushes spin on. replaced brushes and it works great! I just did this now and it is still running. my status light problem is fixed my roomba is 4 years old and I am on my 2nd battery. Seems to have fixed the problem. FYI it was wrapped with hair, dirt and it was greasy.