Garage Door Opener Won't go down
My garage door opener will not go down. When I press the remote it will instantly click and go back up. If I hold the button down then it will start to go down (I know that overrides the sensors). After it starts to go down I can release the button and it will continue to go all the way down without me holding the button. What is causing it to "hang up" at the start of going down. The main unit blinks 4 times telling me it is a sensor problem but the sensors are aligned and the light does not blink. Any ideas? Thanks.