回答“Left wheel is not working properly”Hi there, I am having the same problem, only I have the r 7040. I bought it on Ebay refurbished. Mine I have had it about 6 months and it began to rattle then I started getting the CO2 error and it will just stop now. After some careful research I discovered the rubber on the end of the brush wears out and the man in the video said his sister’s Samsung vacuum was rattling the same way mine is. He replaced the rubber piece on the end, so that it fits more tightly and now its working fine. He did not mention any error codes so I took off the brush and let it run for a minute and the rattling stopped. It want run long without the brush but it run smoothly. I do not know for sure yet if this is the issue, so I have bought another brush but luckily I ran across it on Ebay also. I am going to get the new brush and see if that fixes the issue if not it maybe indeed time to get another or some other to replace it. I will let you know once I get it and see if that fixes the problem.