To unlock the HC220 series: 1) Turn the machine off 2) Lower the humidity dial to zero (If the dial isn't all the way down the machine will not go into the programming mode) 3) Hold down the ramp button on the front and turn on the machine at the same time. When the machine restarts you will be in ...

I have been on cpap since 1991. usualy I can just about search and find anything I need to know. I have a resmed auto set for home use. (yes, I program it myself) I recently acquired a resmed s7 for traveling. I went into clinical setup and set to 17.0 cm H20....the next option was pressure gain. it...