Your CPAP and BiPAP machine is made up of a myriad of parts. You need each part to be working well so you are getting the best therapy possible.
Think of your machine like your car. Your car needs frequent maintenance so that it will work properly. Worn out parts will make your car drive inefficiently and may even cause your car to break down. Broken down or worn out parts must be replaced if you want your car to work.
The same is true of your CPAP or BiPAP machine; it works best with proper maintenance and the replacement of broken down or worn out parts. You will be able to tell the difference with how your machine is working as parts break or wear out.