Chosen Solution
There is a blue light flashing on the machine and it is making a thumping sound
@baldly Roomba 700 and 800: When in Dirt Detect mode, the blue Dirt Detect indicator will flash. You did not tell us which light. The dirt detect is the magnifying light. Make sure that you check the brushes and clean them well. If there is debris stuck on those they may trigger the dirt-detector sensor and you get your blue light flashing.
I had a blue star flashing and a thumping sound. I have the 770 model, so I went to the Roomba site and found this video: https://homesupport.irobot.com/app/answe… It was simply a matter of cleaning the front wheel (I did not know it came out to clean it) and cleaning the brush and roller (I actually replaced them since I had spare parts on hand).
Blue star like light is indicating problem with brush movement. I found dirt under the silicon cover that prevent the brushes from turning.
