If the left ear pod is silent, please perform a new pairing with the right pod like shown in the quick-start guide.
Take them out of the charging case and click the  center button on both the left and the right pod 3 times.
This forces a new pairing between the pods, and the left pod should automatically pair with the right pod from now on once you remove both pods from the charging case.

If you still cannot get the Left ear to play, please perform a factory reset by placing both pods in the charging case, while the charging case is charging. Now press the button on the right pod, and hold it for more than 5 seconds. You have now reset to factory settings. (Please note: If you have performed a factory reset, you will need to remove the headphones or "forget this device" from any smart phone or tablet they were once connected to. This will allow your device to now search for the newly restored headphones under BT devices)


The right pod is the primary, which is connected to your source, usually a smartphone.
The left pod is the secondary, which connects to the right pod.