Does the odor smell like burnt rubber....if so you may have burned out the belt which is common. The filter can smell if you have pets and the machine will blow the odor back in to the room after the filter gets older.Check to see that the roller brush is spinning when it is turned on if not shut it off and try to turn it manually with your hands. If it turns very easily the belt gone if it is almost impossible to turn you need a new roller brush.You can replace the filter to help with the smell but if it is the belt you smell it will go away in time. Also make sure that you have the container on perfectly as if it is not it will not create a perfect seal and you will have very little suction. The other thing you can check is the hose to see if the suction is good through it. If the hose has good suction then the power head may be plugged with something and you will need to get a screwdriver and take the bottom plate off the same way as if you were changing the belt and then you can look for a blockage as well as access the belt and roller brush. I hope this was helpful to you ...good luck
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