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

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I have a Craftsman 1/2 hp chain driven motor. Remote and wall switch will open door. WHEN TRYING TO CLOSE DOOR WITH REMOTE AND WALL SWITCH light blinks as if something blocking sensors..Also lights on sensors are not on.

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You have bad sensor or the wiring going to them. Check to make sure the wiring is not shorted.

Posted on May 17, 2010

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Why wont my 3 remotes (hand held factory in remote)only work to open the door ? They no longer work to open the door.I did replaced the batteries and reprogramed, craftsman 3/4hp chain driven garage d


SOUNDS LIKE SOMEONE MAY HAVE PRESSED THE LOCK / VACATIONS SWITCH ON YOUR WALL CONTROL. IF STILL NOT WORKING AND THE LED IN THE WALL SWITCH IS NOT FLASHING TRY AGAIN TO PROGRAM YOUR REMOTES.

GOOD LUCK

STEVE

Dec 15, 2014 | Craftsman 3/4 Hp Garage Door Opener System...

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Sears troubleshooting


craftsman garage door openers are made by chamberlain.. Give them a call on their 800 number with your craftsman model number and they will help you

Aug 23, 2014 | Sears Craftsman LiftMaster Chamberlain...

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I have two craftsman door openers. They work great with pushbutton on wall, open and close ok. The door opens fine with remotes ( one handheld other homelink in car ) but will not close with remote. It...


If the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure the lights on the sensors are both on and not flickering. Tweak them if necessary. If you cannot get both lights to come on you have bad sensors or the wiring to them.

Dec 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 3/4 hp Chain opener.....Door opens and closes by itself. No blinking light, looks like everything is clear with sensors. Half opens then closes, then door completely closes and 5 seconds later...


You most likely have a bad wall control or the wiring to it. An easy way to check this is to remove the connection at terminal #1 on the rear of the motor unit. Just remember that your wall control will not work with this wire off. Your remotes will still work though.

Dec 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Craftsman garage door opener model 139.53325SRT 1/3 HP, it was working fine and then it would not open, when push the wall switch, the opener hums and the light starts flashing, I have removed the...


It sounds like your door sensors may be misaligned. If when you try to close the door the main light flashes 10 times and the door reverses to the open position this is the case. Make sure the small light on each sensor is lit and not flickering. Tweak the sensors to see if you can get both lights to come on. If not you have a bad sensor.

Feb 24, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener motor doesn't work.


2 flashes is a safety eye issue, but you problen is most likely that the chain is not sync with the limit setting. Take the bottom off the gear and sprocket assemble and rotate center limit srew until it is in the same position as the trolley.

Jan 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door opener will not opern


2 flashes indicate safety eye issue. Check you wiring and make sure it is wired correctly and check to make sure the eyes are properly aligned.

Jan 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

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