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Older tenpro prolift 2 garage door opener ... pressing opener and door starts to open but stops after a few inches ... motor runs but chain stops ... retrying closes door ... never had a problem before with the door stopping?

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 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

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mjrock
  • 8 Answers

SOURCE: Craftsman 1/2 HP door opener bounces back open

Hello,

There should be 2 sensors on the bottom of your door on the inside, 1 on the right side and 1 on the left side.
These sensors serve 1 purpose to send a beam or reflection to each other.
If something is blocking this reflection or is in front of the sensor the door will always come back up.
It is a safety feature so nothing or no one gets hurt when the door is closing!

Posted on Sep 23, 2008

  • 118 Answers

SOURCE: motor runs but door does not open

you have a stripped gear on your opener. Replace gear and sprocket kit

Posted on Feb 08, 2009

  • 3197 Answers

SOURCE: Garage door opener won't open or close door

The drive gear is stripped. Remove the cover and you can see it just in front of the motor. It is white nylon and the part number is 41A2817. Available from Sears or any good door opener service company. It will come with instructions.

Posted on Jun 06, 2009

  • 1 Answer

SOURCE: Chamberlain Power Drive 1/2 HP - motor runs but does not move chain

I have the same problem with the worm gear shaved. I bought the replacement part and replaced the worm gear. The door did not travel to the full distance between the limit switch. It hit the upoer limit, stopped. When I pressed the remote again, it only reverse for a short distance and never hit the other end of the limit switch. Any hints what the problems are?

Posted on Jun 12, 2009

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1 Answer

Garage door moves few inches and stops, springs are fine, sensros are fine.


If it is not blinking when it stops, then the capacitor is blown. Replace the capacitor and it should resolve the problem.

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There are 12 DIP switches inside the motor compartment, which correspond to the switches in the remote. For access to the switches remove the panel at the left side of the motor (1 screw) and you will see the circuit board with the switches

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Sears Craftsman 1/3HP garage door opener problem


If motor continues to run but no chain action check for missing chain tooth or cam gear worn.

Sep 22, 2017 | Sears Craftsman LiftMaster Chamberlain...

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Opener has been working fine for four years. Today, when I pressed the remote to get into the garage, the door opened for a few inches, then stopped, and now the motor will not run at all, via the remote...


The problem may not be the garage door opener, To determine this, Pull the emergency release to release the door from the carriage. (The red cord that hangs from the opener) Now you can press your garage door opener to see if your motor works. If it still does not work, try unlpugging the opener from the power source for approx10 seconds. This should reset your motor.

If the motor works, the problem is with door and not the opener and you need to consult a professional who can help you with this.

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CRFATSMAN opener - Problem when closing only


It sounds like you have a loose connection. Pull the logic board and check for bad connections especially around the small transformer.

Feb 23, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Craftsman garage door opener 1/2 hp will not open door


It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.

Aug 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Sears opener wont open or close more than 12 inches


You may have put the chain back on out of "sync" with in internal up and down stops. You may have to take the chain off the motor sprocket and run the motor to make sure it is stopped in the down position ( watch the rotation of the sprocket to determine up or down position) When the motor is stopped in the down position put the chain back on with the chain Carriage in the down position. Then you can fine tune the up and down stop positions with the adjustment screws on the side.

Feb 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

25 yr+ old Sears opener runs past lower limit


Update: I remembered that I had a problem with the door reversing too much a while back. It was chattering in the tracks and I could not fix it with lubrication and changing spring tension. So I dialed up the down reversing force. This contributed to the jam-up I had when the lower limit was ignored. If I had a lighter force, it may have at least reversed.

After futzing with it I left it alone for several hours. The motor would hum every few minutes. I was considering cutting power to it overnight. I pressed the remote one more time and the motor ran normally to a limit and stopped. I tested it a few times then reconnected the chain and door. Seems fine now. I suspect an intermitten logic board problem. I'll try lightening up the down force and using it for a while.

Jan 06, 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...

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