Fixing a “left wheel fault” on my robot vacuum
About a year ago, I decided to stop sweeping my apartment floors, and instead automate the process with a robot vacuum so I can spend my time doing other things while I sit back and watch. I picked up a Ropvacnic robot vacuum, particularly one with a built-in mop attachment. You simply give it some water and soap and a charge, and then after ninety minutes of cleaning, your floors are dust free, shiny, and depending on the soap, even good-smelling.
Anyways, after working great for about a year, the vacuum finally started giving me issues. In particular, every time I would power up the vacuum, it would shut itself down after a minute or two, and the app that allows me to control the vacuum would read “left wheel fault”. I could reset this error and have it run for a few minutes again before it comes to stop, but that would be very annoying. I’m not even sure what this error means, since it’s cleaning and traversing just fine.
I took the vacuum to M5 to open it up and take a look to see if I can’t fix it up.
I mean, nothing looks broken in here, so I don’t really know where to start. That being said, before even brought it to M5, I did notice that the left wheel was getting a lot more wear than the right wheel, so let’s dig a further grave for this vacuum and pull even more stuff apart.
Here’s the gear assembly for the wheel, and I couldn’t notice anything wrong with it, and it spun relatively freely. I noticed a trigger wheel that was attached to the drive motor, with LEDs on each side for wheel speed sensing. I figured if there was an electric signal to detect wheel faults, it was probably related to this. However, it still looked to be in mint condition. So, I decided to just wipe it down with alcohol to really clean it, and then before I closed up the gearbox, I poured in some multipurpose oil to make sure everything spins super freely. I also used a screwdriver to clean out the wheel wells to try to reduce the wheel wear. Upon putting everything back together, I was pleased to see that the vacuum appears to be working great!
Karl Kreuze
Electrical Engineering, 2026, Computer Engineering, 2026
12 April 2026
https://www.umassamherstm5.org/blog/pyl6dlnzjs50zwhfwq2834vqqmwxxd
