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What's the difference between the "limit controls" & the "force controls" on Chamberlain garage door opener model 1245r?

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Limit controls determine the maximum up and down point for the door, so that it doesn't keep trying to close when it's already all the way down, or continue to open when it's fully open.
Force controls determine how much pressure can be applied against the direction of travel before the door will sense the pressure and stop moving. Imagine setting a watermelon or egg in the way of the door when it's closing. If your force control is not set correctly, it will crush the watermelon or egg.

Posted on Nov 29, 2014

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New Sears craftman 1/2 horsepower garage door opener not staying closed, trolley is hitting bolt stop and auto reversing.Have tried to adjust the down force and the distasnce down setting to no avail?


The 'down limit' on the side of the motor housing is what needs to be adjusted. Turn this control in the opposite direction of the arrow printed on the cover. I usually adjust this so it stops short by quite a bit and then fine tune it.

Oct 15, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

All my door openers r craftsmans with the orange smart buttons at the sears store they sold me one that on the package will work with green or gray does not say orange i wanted to find out before i open...


Compatible with Chamberlain LiftMaster Security+ 390MHz garage door openers with redish orange learn button manufactured from 1997-2005.

Temporary password option to let you give friends, relatives or maintenance people limited access. Program code directly from keypad.

Compatible with garage door opener operator model numbers 1240R, 1245R, 1246R, 1255R, 1256R, 1265, 1280R, 1000SDR, 2000SDR, 1245 GMR, 1255GMR

The 977LM is new version of 976LM.

Taken from Garage repair information

Jul 17, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener craftsman the door closes hits the ground, then comes back up to the open position. I need to know how to fix this problem!! Its a sensitivity problem, force??? So do I need to turn up...


Not a force issue. On the side of the motor unit you will find the down limit control. Turn this control a bit in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary to get it right.

Oct 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster mod 1245R (1999) has indicator light blinks 5 times. Door will not operate from hardwire button. Tried unplugging unit to reset but same 5 blink sequence returned. Held button in to reset but no...


The trolley is most likely jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. Now locate the 'up limit' control on the side of the motor unit. Turn this 2 complete turns in the opposite direction of the arrow printed on the cover. Be sure to replace the bolt.

Dec 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Liftmaster mod 1245R (1999) has indicator lightLiftmaster mod 1245R (1999) has indicator light blinks 5 times. Door will not operate from hardwire button. Tried unplugging unit to reset but same 5 blink...


The LED flashing 5 times is the code for "RPM sensor or motor overload". Usually if it is the RPM sensor - which is a small printed circuit board just in front of the motor - it will run a few inches and then reverse. I doubt very much it is the motor. I would pull the logic board and check for loose or missing traces on the printed circuit. Especially if you have had any electrical storms or power surges.

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

2 Answers

Liftmaster mod 1245R (1999) has indicator light blinks 5 times. Door will not operate from hardwire button. Tried unplugging unit to reset but same 5 blink sequence returned. Held button in to reset but no...


If your door is in the open position and the trolley is jammed against the bolt just in front of the motor unit you need to remove the bolt and then run the opener until the door closes. While the door is closed locate the 'up limit control' on the side of the motor unit and turn the control a couple complete turns in the opposite direction of the arrow printed on the cover.

Nov 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman Garage Opener (Unit run front & back only for 2 second)


Double check to make sure the sensors are wired correctly. The 2 solid white wires go to terminal 2 and the wires with black stripes go to terminal 3. If the wiring is correct then you possibly have a bad RPM sensor. The RPM sensor is a small circuit board just in front of the motor.

Jul 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I can get the door opner to porgram? on a chamberlain md 1245r


On the rear of the motor unit just to the left of all those white wires you will find the smart/learn button. Press and hold the button on your remote and then press and immediately release the smart/learn button. Do this for each of your remotes.

Jul 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman 1/2 hp door opener


replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

Dec 16, 2007 | Sears Craftsman LiftMaster Chamberlain...

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