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Where is the up and down force adjustments located on a liftmaster 2500b

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What does the purple button light flashing on 1/2 horsepower craftsman garage door opener


I think the adjustment mode is on.

For example, that's from Craftsman manual:

""
Setting the Force
The force setting button is located on the left panel of the motor unit. The force setting measures the amount of force required to open and close the door.
1. Locate the purple button on the left panel of the motor unit (Figure 1).
2. Push the purple button twice to enter the opener into Force Adjustment Mode (Figure 2). The LED (Indicator Light) will flash quickly.
3. Push the remote control or control console (Figure 3). The door will travel to the DOWN (close) position.

""

Actually, you should just read carefully your garage door opener unit's manual.

Craftsman Garage Door Opener Remote

Jun 21, 2014 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door closes all the way but then opens again


you can try adjusting the down force. what it sounds like when the hits the bottom the force sensor is saying there is an obstruction and is opening back up . just turn the down force adjustment higher on the logic board. if this isn't the problem you may have to adjust the down travel control, it maybe trying to force the door down to far and causing the force sensor to open door back up. if it is trying to force door to far in travel when the door goes down when it hit bottom you will notice the chain sag or the t bar will bend. good luck.

Sep 24, 2011 | Chamberlain Liftmaster Sears Or...

1 Answer

I have liftmaster garage door opener P/N 41A-5483-4. It worked normally. but all of sudden, when door closing, it reverses automatically at half way down, and garage door light bulb starts blicking 6...


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 axles 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.

LiftMaster Garage Door Opener Frequently Asked Questions

Jan 02, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have a 1/2 HP Liftmaster Chamberlain Garage Door Openner that will neither open nor close now. I have disconnected the door from the carrier. With the carrier up, I press the button and it goes down...


1. Lubricate the chain and the shaft or angle iron that the carrier rides on.
2. If that doesn't work, see if the opener has adjustment screws for up force and down force. If so, try increase the down force about half a turn at a time.
Write back with your results.
Gary

Dec 18, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

The garage door goes up one foot and stops..its a liftmaster professional half horsepower


Disconnect the opener from the door. Operate the opener. It should go back and forth smoothly.
Lift the door. It should go up and down without any problems.
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.

Dec 06, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have a new garage door opener that has the black and purple buttons to adjust the force and travel of the door ...... eveything is working well except when the door closes it goes a little to far, the...


I have a feeling the down force adjustment is set much to high. If the door is hitting the floor hard enough to bend the rail the safety should be reversing the door to the open position. Maybe this will help.

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.

Nov 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

No matter when i adjust the force the door goes down, stops briefely, them returns to open position. can't get force adjust to let it stay down.


If the door is hitting the floor and then reversing it is traveling too far in the down direction. Locate the 'down limit' on the side of the motor unit and turn it in the opposite direction of the arrow printed on the cover. Some tweaking of this control will be necessary to get the travel just right. The force adjustment affects the safety of your opener. Try to put it back where it was.

Sep 30, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a new Sears 315mhz garage door opener and the door fails to reverse when an object is placed under the door


It sounds like the force adjustment may be set too high. Check this:

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.



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

1 Answer

Where are the up force and down force button located on a chamberlain whisper drive plus


They are on the back of the motor unit. You may have to remove a light lens to find them. Just follow all those white wires and they will lead you to them. One caution I want to make is adjusting the down force. This will directly affect the safety of the opener. Use only enough force so that the door closes consistently.

Aug 27, 2009 | Sears Craftsman LiftMaster Chamberlain...

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