How to Fix Charging or Power Issues on Avantree Harmony / Harmony 2

If your Avantree Harmony Multi-Room Audio System is not charging or powering on correctly, follow these steps to troubleshoot both the wireless speakers and the transmitter:

1. Check the correct power method

   • Speakers: Recharge using a USB-C power cable.

   • Transmitter: Must stay connected to USB power (5V / 2A) while in use (no  built-in battery)

2. Verify the charger and cable

   • Use the original Avantree USB-C cable if available.

   • Use a 5V / 1–2A USB wall adapter.

   • Try a different adapter, cable, or USB port.

3. Check LED indicators

   • Speakers

     • Charging → Battery LEDs move/fill.

     • Fully charged → Battery LEDs stay solid.

     • No LEDs → Reconnect the cable and test another wall adapter (5V / 1–2A).

   • Transmitter

     • The power LED should turn solid or flash when powered.

     • No LED → Confirm the USB power source is working.

Still Not Working? Contact us at ✉️ support@avantree.com
Please include these info:
1. Confirmation that the cable and adapter work with another device
2. Any LED color and blinking pattern observed
3. A clear photo of the power adapter label (showing output specifications)
4. A short video showing: how you’re connecting it, the charger, and any LED behavior.