A fuse blows when the current in it exceeds rated capacity. Obviously, it is happening all the time as different fuses keep going south. That means that the motor of your "running good" vacuum is using excessive current.
It is only 8 months old and still under warranty.
Only other thing you can check is the rating of the fuse and the rating of the vacuum. If it is near or same as fuse then that will cause a problem.
Testimonial: "Thank you for your reply, it is appreciated. Maybe I didn't explain the problem right, the vacuum ran and worked good without blowing a fuse for 8 months. Now in the last week, everytime I try to use it, within the first 3 minutes of being turned on, the vacuum blows a fuse. I guess what I was trying to ask was, "why after running good for 8 months with no problem, why would it start to happen all of a sudden, with no other changes in my house. Like I haven't added any additional lamps/appliances to the outlet I use to plug in this vacuum. Thank you again, Sia"
Has the bag been emptied properly? If not, the debris in there forces the motor to work harder, use more current, and perhaps blow fuses. Assuming that is not the issue, read on.
Motors get hot. If you examine the windings of motors you will discover many windings of wire with a minimum coating of insulation on them. If the insulation melts, as it can, the windings now touch each other instead of being separate windings. Ergo, the overall resistance of the winding now goes down, the back emf generated by the motor goes down, and the amount of forward current going thru the motor now is excessive enough to the point of blowing the fuse protecting the circuit.
Now, if you have a circuit breaker in stead of a fuse, a circuit breaker can over a period of time "get old" and pop prematurely when , in fact, all is fine. Check that out if applicable.
If it is not a breaker that has gone bad, the motor has gone bad. **** happens.
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