If the Mijia Air Conditioner displays the error code P4, it indicates overheating protection for heating.
You can troubleshoot it by the following steps:
1. Turning on the heating function in a high temperature environment is a normal protection. If the heating effect is good, it is a normal protection caused by the high outdoor temperature and no action is required;
2. The indoor unit filter is too dirty. Please clean the filter;
3. If the above steps do not resolve the issue, please apply for the after-sales service center for inspection.