Step 6. Check for scaling
If you live in an area with hard water, you may see build-up of non-soluble mineral deposits that can affect your machine's function. Mineral build-up can clog some of the channels that dispense water over your coffee grounds, which can lead to uneven brews.
If you notice mineral build-up on your machine, you may be able to get replacement parts online from the manufacturer. (It's pretty hard to remove mineral build-up in a way that's food-safe.) To prevent mineral build-up in the first place, use filtered water in your coffee maker. This may improve the taste of your coffee even if you don't have mineral build-up issues!