Reset the pressure knob counterclockwise, then set the control lever to inhale and check that the gauge reads between 2 and 5 cmH2O.

Move the control lever to exhale and note that the gauge reads between -2 and -5 cmH2O.

Repeat the inhale and exhale tests with the pressure knob fully clockwise, seeing if the gauge is between 57 and 63 cmH2O.

Release the control lever and note that the lever moves to the center and pressure drops immediately to 0 cmH2O.

If any of these pressures are wrong, see “limited pressure” on the troubleshooting guide.