The remote control of the shutter door can't work downward, but it can work upward. What happened?

Garage door remote control is not easy to use, and the main reasons are as follows: 1. The battery of the remote controller is insufficient, so replace it; 2. The electronic accessories of the remote controller are damp or short-circuited, and the signal is weak. You can open the handle flip of the remote controller and blow dry it with a hair dryer. 3. One or more buttons are out of order. If you don't understand electronics, you need to find a professional master to repair it. Xuzhou Yongshunda doors and windows will answer for you.