E4 indicates that the water inflow has timed out. Check whether the water pressure and inlet valve are dirty or blocked. It means that the set water level has not been reached after 30 minutes of water inflow. According to the "washing doesn't work" in the manual, after troubleshooting, the water can be restored by opening and closing the cover plate once. If no one intervenes, the laundry bed will automatically turn off the power after about 1 hour. Extended content: The sewage outlet of drum washing machine is in the lower right corner. Turn the plug of the sewage outlet of the washing machine counterclockwise to open it. However, it should be noted that before opening the sewage outlet, a bucket or towel must be placed under the sewage outlet to prevent the residual sewage in the pipeline from flowing out, causing sewage pollution to the floor.