Lift Master 1/2 hp won't go down w/o help
I have Liftmaster Professional 1/2hp if you put door down it goes down for a second then light start blinking and door stops. If I hold the button on the wall down until the door reaches the floor then the door goes down and stays down. The door goes up fine. Any suggestions? Just had both springs replaced. If you disconnect door the opener does the same thing, so we don't think it is the door.