Question about Chamberlain 1/2-HP Whisper Drive Belt Drive Garage Access System

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My garage door will not close. The door gets close to the ground, then starts back up again and when it gets to the top the lights flash.

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Just got off the phone from one of the rep's of Chamberlain...Go to the sensor that is blinking(it should be the one with the green light) loosen the sensor until the light goes out, then tighten it back up until the light come back on, and push the garage door opener. it should reset the unit.

Posted on Oct 13, 2010

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Either the eyes are seeing something as the door is closing or you need to reset the down limit tension inside the left lense cover

Posted on Aug 10, 2014

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Garage door opener


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When the temp gets colder, I seem to start experiencing trouble with my garage door. It lets up fine but when its time to close it, the lights flash quickly and will not close. what could be the issue??


I recommend this to everyone with garage door opener problems:

Use the pull cord and disconnect the opener from the door.

Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected?

Next, lift the door by hand from the bottom to the top. Is it moving smoothly?

If not, lubricate the hubs of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well.

Are all cables in all the pulleys, there are 4.

After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

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My mom & I each have a Craftsman garage door opener at our respective homes & live @ 15 minutes apart. Our openers are about 13 to 14 yrs old. The past two yrs. we've both had the same problem. ...


If the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. Make sure both lights on the sensors stay on and don't flicker while the door is moving and the sensors are firmly attached so they don't move. Tweak them just a bit.

Nov 09, 2010 | Sears Craftsman LiftMaster Chamberlain...

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It is sears/craftsman K1026 139.53779 HBW 0709 . Button on the wall inside the garage will open, but does not close . it starts vibrating and the motor light flickering and no advancing. Only if you hold...


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Oct 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

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If when you try to close the door with the remote it starts down and then the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Each of the sensors has a small light that should be lit and not flickering. Tweak the sensors a bit. If you cannot get both lights to come on you have bad sensors.

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My Sears Craftman garage door opener closes about 1/3,stops,and reverses.When I activate the remote again it stops rising,starts down again, comes down another foot or so,stops,reverses etc.,etc,etc It...


If the main light is flashing 10 times when the door reverses it is a door sensor problem. One may have been bumped so that they no longer point at one another. Make sure the small light on each sensor is lit and not flickering. If this isn't the case you might need to increase the down force a little. The control is on the back panel near where all those white wires go. Increase it about 1/4 turn and try.

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2 Answers

Garage Door Wont Close Craftsman 1/2 HP (1998)


What it is is the electric beams at the door are getting blinded buy the sun or out of line. They are the two black boxes on both sides of the door about a foot from the ground. Put a piece of card board in front of them not blocking the beam dut to block the sun. All that they are is safety beams for kids so they do not get hurt. If you have to move them to the top where the sun will not hit them. Sorry to say though you can not remove them all the way. Also make sure the lite on them is not blinking if so they are out of line.

Good Luck and Please Rate FixYa!

Mar 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door goes a quarter way up.


If the wall station is flashing the lock button is on Push and hold the lock button for 2 sec. and release. The light should be solid(not flashing) For you door opening part of the way: If you have a Chraftsman/Liftmaster:
 1.Check to see if the door is running correctly.
  A. Run the door down and pull the emergency release. See if the door will run easily by itself.
    1. If it runs hard by hand try lubricating the rollers and hinges with silicone spray or some form of lubricant (not WD 40)
    2. If the door is heavy and falls back to the ground, you probably have a spring issue (either broken or needs more tension) in this case call a professional door repair company in your area.
  B. If the door runs fine then check the up and  down force on your operator (the box that hangs from the ceiling). If the light bulb(s) on your operator are on the front and/or back, the force adjustment screw is on the back of the operator. If the lights are on the sides of the operator then the force adjustment screw is on the right side (looking from the back of the operator and facing  the garage door). Turn the light blue adjustment screw with the up arrow to a higher number.
C. If this does not solve your problem the top bushing could be going out of your operator. Open the case and see if a lot of black filings are on the top of the big gear. If so the gear assy. will have to be replaced part # 41C4220A

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