1. Make sure the battery is sufficiently charged .
2. iHealth Wave remains in standy mode until you wake it up in order to maximize battery life.
To exit the standby mode, place your wrist in front of you as if you wanted to watch the clock, and make a firm rotation of the wrist. Each rotation changes the display.
You can also tap on the iHealth Wave screen.
3. If your iHealth Wave still doesn't turn on, try to make a Restart Complete.