Green Led Lights not operating No Heart Rate or ECG on applewatch5

I just bought an applewatch5 and used both the Heart Rate app and the ECG app for a week.

Now neither one is working. They start but they don't record anything. Additionally, the Green LED lights on the back don't seem to be lighting up.


I talked to an Apple Rep...he did a diagnostic and could not find anything wrong.


Any ideas?


Posted on Feb 16, 2021 5:40 PM

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Question marked as Top-ranking reply

Posted on Feb 16, 2021 6:37 PM

I don't know if it will help, but (if it is not a hardware problem) 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


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2 replies
Question marked as Top-ranking reply

Feb 16, 2021 6:37 PM in response to coasterrich

I don't know if it will help, but (if it is not a hardware problem) 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


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Green Led Lights not operating No Heart Rate or ECG on applewatch5

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