How to do if the APP prompts that Mi Smart Space Heater always shows offline or can't connect to Wi-Fi?

Problem Explanation
1. Confirm whether the heater is powered on and in normal operation.
2. Make sure that the Wi-Fi is working normally.
3. Please unplug the power cord, power heater again after 10 seconds (the power needs to discharge for a period of time), and reconnect the Wi-Fi.