Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Sears 1/2 horsepower chain drive garage door opener (circa 1993) would not open with remote and light on back of opener is flashing quickly. Tried reprogramming the remote, but had no success and the green light is still flashing quickly and now the opener will even start going up and down on its own. What is probably wrong and can it be fixed easily?

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It sounds like you have a remote with the button pressed or broken so that it is on all the time. Remove the batteries from your remotes and check that light. The rapid flashing is an indication that it is receiving a signal. Make sure you don't have an old remote in a drawer somewhere.

Posted on Sep 28, 2009

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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

Garage door opener makes a clicking sound when activated by the remote or wall unit and the lighton the back of the opener flashes. craftsman.


If the opener is making a clicking sound when it is running the chain is too tight. Post back with the number of flashes from the light.

Dec 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Have a Craftsman 1/2 horsepower garage door opener. When oporating the chain does not move so door will not open.


You have a bad drive gear. It is white nylon and is just in front of the motor. The part number is 41A2817 and is available at any good door opener service company. It comes with instructions.

Feb 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Sears craftsman 1/2 hp garage door troubleshooting


My garage door opener will start to close then stop and go back to the open position. If I put pressure on the door as it is closing sometimes it will close all the way and sometimes it will return to the open position. Can you help me. Thanks pbstation771@verizon.net

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