Hi. This is my first post to the forum. I’m looking for some help with my Roomba 4210. The unit powers up and initiates a vacuuming but quickly starts running in circles, clockwise and counterclockwise, and finally stops and gives the “Oh Oh” and 4 beeps.
Everything I have found says that the 4 beeps signifies a drive wheel problem. I bought a pair of used drive wheels from RobotShop. They arrived yesterday and I replaced the left wheel (nearest the side with the Power button). That wheel appeared to be the one that was not turning. The Roomba would rotate around that side with the right side wheel doing the only driving.
My problem is that the Roomba still has the same problem after replacing the left drive wheel. Is there something else that could be causing this problem?
@gnams_01, we would suggest to also replace the right drive wheel as the wheel encoder could be defective, therefore the robot never knows when to stop that wheel forward or reverse. This could cause the turning in circles. Let us know how it goes.
Well Brian, I thought that you might be on to something. It made sense to me too. But still no joy in Rumbaland.
I replaced the right drive wheel and the original symptom remains.
I suppose that this means that the problem likely lies with the main circuit board?
@gnams_01, still getting the 4 beeps error? Try turning the wheels by hand do you feel the same resistance from both wheels?
Yes. Sill getting the 4 beep error after running in circles, pivoting around the left wheel. The original symptom.
To my uncalibrated fingers both wheels turn with about the same amount of resistance. The two drive wheels that are now installed are the used wheels that I bought from RobotShop. I am assuming that were working when they were removed from the original unit. Also, both of the wheels that I removed (the original wheels for my Roomba) have about the same rolling resistance.
@gnams_01, really sounds like the motherboard ins’t providing the proper voltage to the drive wheel. In that case replacing the motherboards should fix the issue. The motherboard for this model is starting to be rare. You can probable find one on eBay as we don’t have them anymore. You can contact the Support Center if you wish to return the wheel assemblies you purchased.
Thanks for your help Bryan. I’ll see if I can find a motherboard. I think that I’ll hang on to the drive wheels that I bought. They weren’t expensive and, who knows, if I ever get this guy running again I might need them in the future.
To wrap up this thread, I couldn’t find just a motherboard on eBay. I took a chance and bought a used and untested 4210 with an OE battery and no accessories. If the Roomba didn’t work I was hoping to at least get a good motherboard out of it. When it arrived I installed my battery and the unit fired up and did a full vacuuming session! So, as it stands now, I have a working Roomba and a spare unit with (likely) a bad motherboard and a worn out OE battery. I am happy to be back in business!
