When I arrived unit was put together but the window wasn't working. tested and found DC control bad power in but no dc power out. will obtain and return. unit is down and requires parts. 2/24/21 Removed control cover and controller. wired new one in and put cover back on. turned power switch on and lite lit but nothing happened. went to front of window and pulled cover. found fuse open on power supply. replaced and tested window and it worked. put panel back on and went inside. closed window manually and turned power on. stepped in front of sensor and window opened. after 3 seconds it closed. unit is operational job complete.