my ecg isnt working on the watch itself. How do I get it working again?
Is there something wrong the crown of my watch or would it be the app?
Apple Watch Series 4, 7
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Perhaps this article will help;
Taking an ECG with the ECG app on Apple Watch Series 4, Series 5, or Series 6 - Apple Support
Generally, the first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:
How to restart your Apple Watch - Apple Support
Restart your iPhone - Apple Support
If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This deletes all temp and corrupted files and re-indexes the file system.
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support