The Xiaomi Home Assistant is a cutting-edge smart home system designed to integrate and control various Xiaomi devices, including air conditioners. However, some users have reported issues with the system, particularly after updating to the latest version. One common problem is the malfunctioning of the air conditioner's on/off switch, which can only be turned off, not on. This article aims to provide a detailed analysis of the issue and offer practical solutions to resolve it. The problem is characterized by the air conditioner's 'on' button being unresponsive, while the 'off' button functions normally. To reproduce the issue, users can follow a series of steps, including checking the device's status in the Xiaomi app and attempting to turn it on through the Home Assistant interface. The expected behavior is for the air conditioner to turn on and off smoothly, with the 'mode' button functioning correctly. To resolve the issue, users can try restarting their Home Assistant system, checking for firmware updates, and ensuring that their Xiaomi devices are properly connected. Additionally, users can try resetting their air conditioner or seeking assistance from Xiaomi's customer support team. By following these steps and troubleshooting tips, users should be able to resolve the issue and enjoy seamless control over their Xiaomi devices through the Home Assistant system.