Q: No function at apple watch

Hi Dirk

It is possible that your watch has entered Power Reserve mode, which happens automatically if the battery falls to a low charge level. Within this mode, the watch can only be used to tell the time (by pressing the side button once). This is designed to keep this function available for as long as possible when the battery is low.

To turn your watch back on: press and hold the side button until you see the Apple logo and wait for your watch to restart.

However, you might need to charge your watch first (it will not restart whilst the battery remains low). Try charging your watch for around 2.5 - 3 hours. It is normal for the watch, power adapter and charging cable to become warm (but not too warm) during charging.

More information:

Using Power Reserve - Apple Support

Check your battery and charge your Apple Watch - Apple Support

Keep Apple Watch within acceptable operating temperatures - Apple Support

Also try force restarting your watch: press and hold both the side button and Digital Crown for around 10 seconds, until you see the Apple logo.

You're most welcome!