What to do if the Xiaomi Smart Doorbell 3S and the indoor chime cannot be paired successfully?

For this issue, there are some troubleshooting methods as below:
1. The chime will ring once by default when it is powered on. If it does not ring, check whether the power supply of the socket is normal. If the power supply is confirmed to be normal, it can be judged that the chime is abnormal;
2. Press and hold the chime pairing button for 3 seconds as prompted, then the chime will ring the prompt sound, and the doorbell will enter the pairing mode. The pairing mode lasts for 2 minutes. After didi rings twice, the chime exits the pairing mode;
3. When pairing, the network connected to the doorbell should be normal;
4. The best pairing distance is 2m between the doorbell and the chime (do not install the doorbell on the door);
5. Avoid inserting the chime and other electronic devices into the same socket.