Roomba moves backwards slightly then turns and turns moves backwards runs in circles then starts flashing exclamation point
SOURCE: my roomba starts going backwards
I turned my shop vac onto "blow" and blasted my roomba with this problem. It worked!!! I had already cleaned it thoroughly, but it needed to be blown out. My only regret is that I did it in my shop, rather than outside. It was pretty dusty.
Thanks again for the tip. Saved me $100+
SOURCE: Dont move forward.
Blow out the unit with compressed air, particularly around the wheels and under the bumper. Tap the bumper with your hand.
If your Roomba stops and beeps at you, count the beeps AFTER the initial "uh-oh" tone. Then call customer support (1-877-855-8593) for assistance.
Good luck.
SOURCE: backs up spins in circles, then red light flashes and beeps
Sounds like either the battery is bad or not being charged properly with subsequent loss of programming.
SOURCE: Roomba circles
Yes, this is known issue and if your bumper moves freely, you might be facing a sensor fault caused by poor quality of components.
Here is a guide to fix it
http://www.schneordesign.com/Avi/irobot/roomba_mod2.htm
Have fun
Avi
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