Try the following steps to resolve the connection issue on the Mijia Air Conditioner Pro Eco Inverter 1.5 HP:
1. Check if the air conditioner is powered on and in pairing mode. Unplug the device for 10 seconds, then plug it back in, or reset the Wi-Fi settings before reconnecting;
2. Please check if the connected Wi-Fi is a 2.4GHz network. The air conditioner only supports 2.4GHz Wi-Fi and does not support 5GHz Wi-Fi;
3. Ensure that the router is within a reasonable distance from the air conditioner and that it is functioning properly;
4. Make sure the router's SSID and password do not contain Chinese characters or special symbols, and verify that the entered SSID and password are correct;
5. Try connecting using a mobile hotspot to check if the issue is with the router network;
6. Update the Xiaomi Home App to the latest version or uninstall and reinstall it. Make sure to follow the step-by-step instructions in the Xiaomi Home App to connect the air conditioner.
If the problem persists, please contact the after-sales service for further inspection.