Yamaha TW-E3C True Wireless Earbuds (Red) - Manual (Page 39)

Troubleshooting
Read this first
If this product does not operate normally while you are using it, first check the following.
[Search tag] #Q01 Troubleshooting
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After putting the earbuds back into the charging case, wait for at least 10 seconds and then take
them out again.
If this does not solve the problem, initialize (factory reset) the earbuds.
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“Initializing (performing a factory reset)” (p.50)
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Make sure that this product has been sufficiently charged.
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“Charging the earbuds” (p.12)
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“Charging the charging case” (p.14)
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Update the firmware of this product to the latest version.
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“Updating the firmware” (p.51)
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Check the following items according to the trouble you are experiencing.
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“Cannot connect” (p.40)
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“Power will not turn on” (p.42)
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“The product cannot be charged” (p.43)
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“The product does not operate or play back” (p.44)
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“No sound can be heard” (p.45)
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“Sound can only be heard from one earbud” (p.46)
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“Sound is not good or sounds strange” (p.47)
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“The sound is distorted, noisy or choppy” (p.48)
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“Using only one of the earbuds” (p.49)
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“Initializing (performing a factory reset)” (p.50)
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Troubleshooting > Read this first