My 1996 Craftsman 1/2 h.p. garage door recently starting reversing itself every time it makes contact with the garage floor when closing. I have tried to adjust the up and down limits and it seems to make no difference in the travel distance for the door - even when i make radical adjustments to them. When opening, the door is also running all the way up until it hits the bolt that stops it from hitting the unit itself. What could i do?
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Deb, that reversal is a child safety device - if the bottom edge of the door detects contact with any object, it'll immediately reverse so it doesn't kill a child. Or a cat, dog, whatever.
The opener mechanism should have a stop switch that prevents the door from closing hard against the floor - that stop switch needs to be adjusted so that the door will stop JUST before hard contact. That'll take care of it "bouncing" off the floor & reversing. As to it reversing before it touches the floor... examine both guide rails closely to see if there's any obstruction that the door's bottom edge may be contacting to trigger the child protection reversal switch.
Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. If you cannot get both lights to come on you have bad sensors.
It could be closing too far or the sensitivity could be set too sensitive.
Lube the springs, wd-40 rust may be the whole problem.
If the door hits and the opener continues to move until the rail flexes upward and then reverses - probably the travel adjustment.
Does the door close and stay closed if you hold the wall button down constant until it closes? - this would indicate a safety eye problem.
If the door reverses before it hits the floor or just as it hits the floor it could be the sensitivity or if the safety eyes are mounted to the track they could be flexing enough to move the eyes out of alignment.
If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is not flickering ever so slightly.
If the door reverses when it hits the floor it is a sign that the door is traveling a bit to far. The adjustment for this is on the side of the motor unit. Turn the 'down limit' in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.
If the main light flashes 10 times when the door reverses it is a door sensor problem. Each sensor has a small light that must be on and not blinking for them to work properly. If one of them is not on tweak them a bit to make sure they are pointed at one another.
The stopping about 1/3 of the way up is either a broken door spring, a main drive gear that is going bad or an adjustment to the 'up force'. The 'up force' control is on the back of the motor unit near where all those white wires go. Increase it a bit. It will sometimes compensate for a gear that is going bad but if this is the case it will start doing the same thing soon.
If the main light flashes 10 times when the door reverses it is a door sensor problem but if the door is hitting the floor and reversing and the main light is not flashing then the door is closing too far and the safety thinks it has hit something. On the side of the motor unit you will find 2 controls. One of these is the 'down limit'. Turn this in the opposite direction of the arrow printed on the cover until the door closes but does not reverse.