This is my husband's unit, a ResMed AirSense 10 AutoSet that was purchased new 2.5 years ago, and it's out of warranty.
FYI:
The water chamber and gasket are newer and in very good condition. We know the noise that a bad water chamber gasket can make, so this noise isn't that.
We even squeezed the water chamber and made sure that it's pushed in all the way and properly seated.
The tubing is new.
The filter is clean.
This noise doesn't sound like "dying cow" to us.
So, we are at a loss at what this is.
We called our CPAP doctor, and long story short, any repair or replacement would be 100% our cost since my husband isn't on Medicare.
So, we are hoping for some clear answers, and soon. The noise is loud and my husband can't sleep with this machine, especially since the noise basically "punishes" him for breathing, as it oscillates with his breathing and is louder and higher pitched on the inhale.
Thanks in advance!
YouTube link:
https://youtu.be/dQFPC01WqHc