Left AirPod will not play sound

If you have already checked the audio player that you are using to make sure that it is providing a stereo output, then it may be possible that this left AirPod is faulty.

Ref:

• If your left or right AirPod isn't working - Apple Support
• AirPods Service and Repair - Apple Support

CatM2021 Said:

"Left AirPod will not play sound: Is there a setting that has caused one airpod not to play?"

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Verify the Balance:

A. On an iOS Device:

1. Go to: Settings
2. Tap: General
3. Tap: Accessibility
4. Scroll Down: to Hearing
5. Adjust: the audio volume balance

B. On a Mac:

Go Here: Change the Sound Output Settings on Mac - Apple Support