Yamaha TW-E3C True Wireless Earbuds (Red) - Manual (Page 45)

No sound can be heard
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The earbuds are not connected to a Bluetooth device.
Pair this product.
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“Pairing for the First Time” (p.19)
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“Pairing with a Different Device” (p.21)
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“Connecting to two Bluetooth devices at the same time (multi-point connection)” (p.24)
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The volume is too low.
Raise the volume.
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“Playing back Audio on this product” (p.31)
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The audio stopped playing back.
Start playback.
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“Playing back Audio on this product” (p.31)
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Troubleshooting > No sound can be heard