We use cookies and other tools to enhance your experience on our website and to analyze our web traffic.
For more information about these cookies and the data collected, please refer to our Privacy Policy.


Joined Mar 2024
Joined Mar 2024

This issue is specific to ResMed AirSense S-11. Please do not reply about older AirSense models. They do not have this problem.

13 year CPAP user. I used a Resmed S-9 for 6 years, and S-10 for 7 years. Never have had any rainout of humidity / tubing issues. Just switched to an S-11 and have had nothing but problems.

I have been getting horrible rainout problems. Here are the things I have tried (multiple times)

  1. Set Climate Control to Auto Result feels like no humidity at all. I wake repeatedly in the night because I am dried out and end up with a sinus headache due to no moisture.
  2. Bought a hose cover. Doesn’t seem to make any difference.
  3. Have tried all sorts of settings for humidity and tube temp Nothing seems to work. I am either dried out or rained out. No middle ground.
  4. Replaced the heated tubing Interestingly, that seemed to help on the first night. But the second night, I was back to rainout.
  5. Tried putting the tubing under the covers in addition to the hose cover. It does not seem to make a difference.

The tubing never feels warm. With my S-9 and S-10, I could feel the tubing warm up. The water tank level does decrease (but I think the water mostly ends up in the tubing).

I saw a post on here from two years ago, but saw no solution for a S-11. Lot’s of people replied with their experience using a S-10. But I have never had problems like this with an S-10. This seems specific to the S-11. There was no solution for the S-11 on the other post. Just replies about similar issues.