I've been using my own S9 for almost a month now. My humidifier arrived about two weeks ago. I haven't received my ClimateLine hose yet.
The last 4 days I've gotten lazy and haven't replaced the water in the humidifier tub. And the last couple of nights a strong annoying plasticky-oily smell started coming out when I switched on the machine.
At first I thought it might have been the humidifier. I removed, emptied and refilled the tank with fresh water and I washed the mask. The smell was still there.
Then I detached the humidifier from the main unit. I switched on the machine without connecting the hose and sniffed the output. The smell was coming from the inside of the machine.
Then I let my mother smell it and she said it's normal and that her machine smells funny as well.
Does anybody know what's causing this smell and why it has become so strong after 200 hours of use?