The issue here is that the machine is not supposed to whine. Some people report absolutely quiet machines, while others, such as myself have a distinct whining sound that comes from the blower unit (not the humidifier). It sounds like an air whistling or gear whining noise during exhalation. Inhalat...

Hello all, I also have a new S9 Autoset and it does whine. My sleep doc has had the same problem with other patients. She said it must be a bad batch as some of them do not make the noise. I have tried another and the whine was barely perceptible. I called Resmed and they said to have my DME sent my...