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If you have eliminated the obstruction sensor, I would suggest a few things. Is the door spring set at the proper tension - usually check by releasing the door safety and manually closing/opening the door. It should balance about halfway up/down. Openers have limit switches for travel, if one is incorrectly positioned or faulty, it can cause similar issues. Openers have torque limit controls, if the motor thinks it is working too hard it will stop. Is the door greased and moving freely when you manually tested it for the spring tension? Are the gear sprockets firm and greased?
If when the door reverses to the open position the main light flashes 10 times it is a door sensor problem. Make sure the sensors are pointed at one another and the small light on each one is lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you have a bad sensor.
If this is not the case try releasing the door from the opener and operating by hand. Is there a point where it binds?
Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure the door sensors are not loose so that they move when the door is closing, nothing is in between the sensors and the lens on each one is clean. Make sure all the wires on the back of the motor unit are snug at the terminals.
What I'd do first is disconnect the opener and see how easy the door opens. You didn't indicate what type of springs you have on the door. You should be able to open and close the door by hand for the opener to operate it. If you have a torsion spring, and there is a problem with that it is not recommended for the homeowner to replace or adjust it. Extension springs are not as dangerous. If the springs are ok, and you feel a binding, lubricate the wheels and track. Once the door moves freely, re-connect the opener. IF it won't open it now you should be able to adjust the "force" for open and close. Just make it strong enough to do the job, so it will work if there is an obstruction. You can test this by putting a 2x4 under the door when finished, and it should open back up if it hits the 2x4, but not if it hits the floor.
On the back of the motor unit you will find the down force control. You may have to remove a light lens depending on your model. Increase this a 1/4 turn and try.
with the door down, disconnect with the emergency release, see if the motor operates
with no load...if the the track moves you probably have something obstructing the door
ie; a broken spring, door locks, etc ... the chain should be adjusted for just a little
**** mid way down the rail (1/4") if it still doesn't move ... call sears.
If the door operates freely without any binding, while operating it manually then It would appear that the obstruction sensor mounted across the doors path is ether out of alignment, lens dirty,or malfunctioning
release the door from the opener and see if door moves freely the check proper torsion by moving door up to 3-4 ft if it stays in this area torsion is properly set if not call technician to adjust torsion
if door does not move freely all the way up and down check for binding track alighnment and roller condition. the adjust closing pressure.
There are adjustments on the unit itself that control the distance door travels to close as well as the force it uses to close. The info and location of controls is indicated in the manual that came with your unit.
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