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I have a Merlin mt5580 garage door opener. It often won't close all the way down. There is nothing obstructing it, I think the sensor needs to be re-set. Can you please advise how to do this. DD

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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ctf1800
  • 4402 Answers

SOURCE: Garage Door Opener Intermittingly Reversing

try adjusted the sensor controls on the sode of the unit other wise replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

Posted on Jan 10, 2008

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  • 6 Answers

SOURCE: Chamberlain Liftmaster Pro. Garage door Problems closing

The sensor eye - or more likely, the other end, the sensor light - probably got knocked out of alignment. The eye should have an LED on it - possibly one that glows green when it's ready to close or red when it's obstructed or out of alignment. Try adjusting the light until the LED on the receiver glows green.

Posted on Dec 07, 2008

  • 244 Answers

SOURCE: GARAGE DOOR OPENS BUT WILL NOT CLOSE AUTOMATICALLY

is bulb on motor flashing 10 times. then you have electric eye problem. otherwise, sounds like you need to increase down force a hair. adjustement is on logic board, right knob.

Posted on Jan 15, 2009

  • 3197 Answers

SOURCE: My garage door opener won't close the garage door.

Most likely your door sensors have been bumped and are not aligned properly. Make sure they are pointed at one another and the small light on each one is lit and not blinking.

Posted on Apr 30, 2009

Mrteaze
  • 101 Answers

SOURCE: Garage Door will not stay closed.

You need to check the adjustment for the travel of the door ... All automatic closers have a built in safety mechanism that prevents children, pets and even yourself from being crushed by the door ... so if the travel is set to low the door will hit the ground too hard and safety mechanism will activate opening the door again! Look at you documentation for how to adjust this for your particular model :)

Posted on Sep 29, 2009

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The closing force may make it think the door is hitting an obstruction. Also make sure the door is not binding in the track and all the rollers are oiled and work smoothly. And nothing is obstruction the optical sensor. Thx

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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?

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Check that the wheels and bearings are turning freely and that the door is not cocking to one side when closing. If the wheels are catching because of bad bearings, because the tracks are out of true or because the door is not staying straight in the tracks, the motor thinks that the door is hitting a car or a person and reverses. One thing to try: disengage the motor and try moving the door through the full traverse. Most automatic doors have a pull-cord that disengages the door from the motor. CAUTION: You may need a friend to help with the door, because it could be surprisingly heavy,.

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Garage door will not stay closed. hit remote button when door is down to keep it closed


Assuming that you do not have anything interfering with the obstruction sensor located at the bottom/sides of the door opening, you most likely will need to adjust the "force-down" control. This control switch should be located on the power-head of your opener. An arrow should indicate direction to turn to increase the force down. You must be careful not to increase it too much or you will create a crushing danger for pets and children. Turn only a little at a time until a test keeps the door closed. You must then place an obstruction under the door (1 inch tall) to make sure it still reverses when an obstruction is met. Sometime temperature conditions will affect the correct operation of the opener and it will need readjustment.

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1 Answer

My garage door when closing goes down to about 1 foot from floor then goes back up. There is no obstruction. It will not go down to floor and stay down. HELP


There might not be an obstruction, but the opener THINKS there's an obstruction.
Check that there is nothing between the lenses of the two sensors. Even a spider web can trigger the safety.
If there is truly NOTHING obstructing the sensors' view of each other, then you should carefully re-align the sensors.
Also, make sure that all the screws and bolts on the rails are good and tight. As the door is used, bolts can loosen, which makes the rails start to vibrate and rattle during the door's movement. Eventually, all this vibration can make the sensors lose alignment.

Apr 29, 2011 | Electrical Supplies

1 Answer

I have a liftmaster Model 1240. Door will open by remote or wall opener. The door will only close while holding wall opener button down. If i try and close via remote, light starts blinking and door...


The only thing that will cause the main light to flash 10 times and the door to reverse to the open position is a sensor problem. Make sure the light on each sensor is on and not flickering ever so slightly. Make sure they are not moving when the door starts to close. Lights on sensors should not blink. One light should stay on constantly and the other sensors light should go off when you block the sensors.

Jan 22, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door won't close unless I hold the main button down in the garage. As soon as it closes it opens up again unless I press the button quickly. I can open it up using the remote, but cannot close it...


your garage door has saftey sensors at the door
these are photo eyes
in the owners manuel that came with the opener
that has pictures in it which would help
the photo eyes need to be clear of debri and aimed at each other with no obstruction
there are leds on each sensor and when aimes properly they should be light if i remember correctly
if you can not get them to light then you may have to replace the sensors

Oct 27, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door won't close. I push the remote and


If your springs were sprung it would not be that easy to open.The reason it crashes down is because they have the door balanced good for the door opener.Check on the door opener itself and see where the reset button is.Maybe something was obstructing to not let it open..Look for the reset and that should get you going on the door opening and closing.Just going to have to figure it out why it did that..

Mar 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

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