Thank you Sierra. I will give this a try.
I have had my resmed airsense 10 capap for sleep apnea for four years. It has started hissing on and off in the middle of the night. Take the water/humidifier chamber out and putting it back in usually helps the problem. I have already replaced the chamber and tubing and that doesn't change the situation. Calling resmed or cpap supplier does not help. Has anyone had this problem? I think it might be the gasket type parts that are between the chamber and the unit but they do not necessarily look easy to get out and I haven't seen them available doing a quick google search. I wanted to post a picture of it but that function doesn't seem to work correctly on this site. Anyone else have similar experience with their cpap and been able to fix? thanks