So, I’ve been limping along keeping my 400 series Roomba’s alive when I picked up a 500 series with problems. I researched the problem and haven’t found any fixes. it does the typical circle dance, however once I get into the test mode, it reveals a strange problem. The right side wheel won’t go forward, but will go backward. I’ve tore it apart and looked at the gears and everything is good. The bumpers and cliff sensors test good. What could be the problem?
Hi bfr57, have you verified if one of the bumper sensors is not stuck triggered?
If they are okay, the problem can be caused by either a defective wheel motor or the motherboard. You can try plugging the motor directly to verify if it can go forward as well as backward.