Infrared detection not working-Check if the protective film on the infrared cover of the Smart Trainer has been removed. If it hasn't been removed, it will prevent the infrared from detecting normally, thus failing to output left-right balance data.
Firmware version too low-Confirm whether the firmware version of the Smart Trainer is 0.108 or higher. If it is lower than this version, the Smart Trainer firmware needs to be updated.
Connection protocol not supported-The Smart Trainer itself supports left-right balance and pedal smoothness data, but the FEC protocol doesn't have left-right balance field. In the bike computer, you need to use the power meter option, and the bike computer must support the connection and be able to display this field. Reconnect the Smart Trainer using the ANT protocol.
Abnormal connection-You can try unplugging the power of the Smart Trainer and restarting it, then reconnect the bike computer for testing.
Abnormal device hardware-If none of the above methods work, there may be abnormality with the device's infrared cover, and you need to contact the brand for repair service.