When you see 18.8 on your Z1 or Z2 screen, it is part of the normal start up sequence and should go away when the device is ready in stand by mode and showing 0.0.

If it does not go away, it could indicate that there is a defect with the display panel, and will need to be returned through the provider you purchased your machine from.

Please contact us at customerservice@smallCPAP.com or call 855-436-8729 and we will advise on what steps to take.