If you notice that the wheel turns freely when removed, but immediately has resistance when installed then this is an issue with the computer circuit. Possibly it got wet, and a line on the board shorted it out. if replacing the wheel module did not fix the issue, then you need to get a new computer circuit board. unfortunately, the last I checked you can’t buy the circuit board separately, but have to buy a whole new roomba minus the battery. last I checked they were selling the roomba sans battery for about $500. if you are lucky you might be able to find a board on ebay or some other outlet.