Two nights ago after about 3-4 hours it started beeping and flashing. I couldn't shut it off by pressing the button so I unplugged it and quit it for the night.
Last night after three hours of use it started the double beep, the ramp light started flashing and the unit quit operating. The screen said "service required". I unplugged it and plugged it back in; the screen said 4.5cmH2O, but it worked normally for the rest of the night.
Do I still have a problem and if so, what might it be?