Third-party parts usually won't void your warranty.

No, not automatically — but there are limits.

The Magnuson-Moss Warranty Act in the US makes it illegal for companies to void your warranty just because you used a third-party part, unless they can prove the part caused the failure. That’s the law. So swapping a vacuum filter or replacing a blender blade with an off-brand won’t kill your coverage.

The catch? If that cheap brush or filter actually damages the machine, the repair for that damage won’t be covered. For example, a third-party vacuum filter that lets fine dust through and burns out the motor — that motor repair is on you. But your warranty for unrelated issues (like a broken switch) still stands.

Companies love to scare you into buying their overpriced accessories. Don’t fall for it. Just keep your receipts and don’t use parts that are obviously wrong for the job.

A little bit of common sense, a little bit of consumer law, and you’re fine.