After two nights....upon early AM wakeing with "clicking" noise......removing the reinserting water tank seems to solve the problem....for a while.

Defiantly Not Rainout...in early moring.... switch to spare (dry) hose & mask ...still get click. The only forum post that seems pertinent mentions the tank seal fit.

I have had my Air Sense 10 for one year....it just started making a clicking noise (in the unit...not the hose or mask) in the early morning after a full nights sleep . Apria gave me a new unit and after last night (its first use) the "clicking" is WORST than my old unit. I have read the humidifier ...

Has anyone had tooth alignment problems using a nasal mask?
I had braces on my uppers years ago and I have the feeling the nasal mask (which I love) may have slight pressure against the front teeth roots. Visit to ortho guy may be in order. (I use light tension on all straps)