The Mijia Air Conditioner displays the error code U1.3, which means there is a current failure in the compressor. It can also be caused by problems with the outdoor unit's electronic control panel and compressor. You can try to turn off the power of the air conditioner for about 3 to 5 minutes and then turn it on again to see if it can be restored. If the above method cannot solve the problem, it is recommended to apply for after-sales inspection.