Check the travel, it may set too much.
SOURCE: Door will only close when held down
That normally happens when the sensors aren't aligned. Both sensors have led lights on them the yellow/orange one will stay on all the time the green one will go out if it cant see the other sensor. Possibly theres a wire that's broken or the other sensor is really out of alignment. Check every inch of wiring from the sensor to the opener, remove wire nuts if present and check the connections. The wires that are used are small, solid and can break easily. Also see if there's a staple that's too tight, move the wire abit where it's stapled and look for damage.
SOURCE: Chamberlain Liftmaster Professional 1/2 HP
Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.
SOURCE: Garage door won't stay closed
Check the down limit:
If the light bulb(s) on your operator are on the front and/or back, the limit adjustment screw is on the left side of the operator (looking from the back of the operator and facing the garage door).. If the lights are on the sides of the operator then the limit adjustment screw is on the left side (looking from the back of the operator and facing the garage door)
SOURCE: Garage door opener doesnt close the garage
If you have to hold down the button to close the door, you are bypassing the sensors ...
Check the alignment of the sensors. Should see a solid GREEN light
SOURCE: Chamberlain hd900d garage door opener
You will have to open the unit and look inside it. Unplug it first. It should have 6-8 screws to take off. You will see 3 white plastic adjustment screws. There is a carriage they sit in. Make sure they are in this carriage. If you would like stay back a bit and plug it in and watch it run to see how it works. It is a direct contact system, so when the middle screw touches the copper limit of the limit screw it stops. Thanks BB
The
force adjustments control the pressure used to open and close the
door. A new garage door opener from the factory is set to the lowest
possible force adjustment. If you have a properly balanced door, the
forces required to open and close the door should be minimal.
The
force adjustments are usually located on the rear of the garage door
opener and/or under one of the light lenses, If your opener has two
lights. If you have lights on the side of your opener, the force
adjustment will be located under the right light lens. The force
adjustments are labeled with an arrow indicating open or close and
numbered 1 to 9, with one being the lowest force and nine the
highest. The force adjustments can only turn 260 degrees, or ¾ of a
complete turn. Changes to the forces should be done in 10-degree
increments. Please remember that too much force will interfere with
the proper operation of the safety reversal system. Do not increase
the force beyond the minimum required to close the door. Do not use
the force adjustments to compensate for a sticking, binding, or
unbalanced door.
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