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I have a Chamberlain AccessMaster 1/3 HP . Door stops when closing at 6 inches off the ground. No blinking lights on the unit, can only be closed by having the door go up/stop it/ then down again.

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  • Master
  • 2,156 Answers

Adjust down force limits

Posted on Apr 22, 2015

  • Ian Watts Apr 22, 2015

    Works now!!! Thanks a mllion !!

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Posted on Jan 02, 2017

  • 2 Answers

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.

Posted on Jul 25, 2008

ltfrc
  • 227 Answers

SOURCE: New Craftsman 95320 1/2 hp chain drive only opens door ~6"

Try this link
http://www.garagedooropeners.us/helpgifs/chamberlain_troubleshooting.html

Posted on May 25, 2009

  • 3197 Answers

SOURCE: Craftsman 1/2 HP garage opener opens only 6 inches

Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. It may be stripped. Take a close look at those door springs. They can sometime appear to be okay when one is broken.

Posted on Oct 10, 2009

  • 3197 Answers

SOURCE: Access Master 1/3 HP garage door does not close, blinks

Most likely your door sensors are out of alignment. Make sure they are pointed directly at one another.

Posted on Apr 12, 2010

  • 3197 Answers

SOURCE: Chamberlain 1/2 HP garage opener main part

If the main light flashes 10 times you have a door sensor problem. Make sure the small light on each sensor is on and not flashing. Tweak them if necessary. If the main light does not flash then you can try increasing the down force just a bit. This is a control on the side of the motor unit where the small gray antenna hangs. If this doesn't work you probably have a bad IR sensor which is a small printed circuit board just in front of the motor.

Posted on May 11, 2010

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1 Answer

LiftMaster Pro 1/2 hp 41AS050-1 won't shut. when


Check the resistance down button (There is one for down and another one for up). You may need to adjust the sensitivity. That way even if for some reason the have hard time coming down, less sensitivity may solve that issue.

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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.


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.

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1 Answer

My door closes fine, but when opening, it only


Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and may be stripped. If so you will also find what looks like white sawdust inside the motor unit.

May 15, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Access Master 1/3 HP garage door does not close, blinks


Most likely your door sensors are out of alignment. Make sure they are pointed directly at one another.

Apr 10, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2 HP garage opener opens only 6 inches


Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. It may be stripped. Take a close look at those door springs. They can sometime appear to be okay when one is broken.

Oct 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

4 Answers

Chamberlain 1/2 HP door opener will not work (102 1499A))


sounds like the clutch in the motor is slipping, perhaps the chain is getting kinked on something. check to make sure there is nothing in the way of it and that it is on track going into the motor

Jun 22, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Opener will not reverse


FIRST YOU NEED TO RESET THE CHAIN .

Unplug power
Release the door from the opener close the door manually. take the chain loose and slide the traveler down to reengage with the trolley. Plug in power, run the unit with chain off untill it completes a clockwise cycle and stops. reconnect the chain and set tension.

Adjust the chain tension.

If it still moves 6-8 inches and flashes 5 times. the problem is in the rpm sensor.

Full diagnostics are in the owners manual - FREE at
http://help.chamberlain.com/help/en-us/InstructionManuals

Oct 06, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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

Dec 24, 2007 | Sears Craftsman LiftMaster Chamberlain...

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