Popping Cracking Sound

[zonk]

Is anyone else having this problem? The discussion on the one that turned off in the middle of the night sounds like it was also part of the S8 recall: electrical failure such as intermittent power, cracking sounds, sparking, and charred smell.

That is entirely different problem, I don,t think Resmed going recall those S9 affected machines. Some S9 humidifiers make clicking sound every few seconds not sure if its a fault or to do with software upgrade. If the noise is loud enough disturbing you, call Resmed customer service, I,m sure they,re aware of the problem and will do their utmost to help (hopefully), let us know what they say

[Bompa]

I hear those sounds through the night when I try to roll over. It's just my old joints poppin' and creakin' when i move.