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

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Chamberlain Liftmaster GDO just clicks, no lights no open/close

Chamberlain Liftmaster series GDO, has been working just fine for 5 years. Suddenly it acts dead, as if no power. Remotes, inside hard wired control, nothing shows power, no light bulbs work. Pushing remote button or manual button unit 'clicks' but no action.

One door sensor light was out, thought that was bad, replaced that, so both lights have indicator, still no change. There were thunderstorms at the time, maybe power surge? Everything I find seems to point to replacing the logic board, but hate to spend $$ if it doesn't fix the problem.

I've unplugged the unit overnight to 'reset' no change. The 'learn' led flashed bright 5 times, that points to overheating.

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Pull the logic board and check it for burnt or missing traces on the printed circuit. Thunderstorms love logic boards.

Posted on Apr 26, 2010

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My garage door opener has power but it doesn't work, sensors got power too, at times it seams to work but it only goes in one direction


If the GDO will only open the door, it could still be the door sensors. They may be slightly out of alignment, or there may be some spiderwebs or debris blocking the sensors. Readjust them by eye.
An easy way to tell for sure is to close the door, if it does not move or goes part way and reopens (caused by the sensors) the light on the GDO will flash 5 times to let you know the sensors have been activated.
On the older machines, there used to be a plug where the wire connected to the sensor. They would corrode due to dampness/moisture. If it is the older style with the plug, replace the sensors.
Also, if the sensors are to blame for your problem. pushing and holding the wall button will close the door fully.
Good luck.

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1 Answer

My clicker wireless keyless keypad won't open my liftmaster garage door


First, check the battery inside the keyless entry. It may have died and that is the whole problem. Replace it if necessary. If it has never been replaced previously, you might want to do that now anyway..
On the GDO there is a "smart" button located by where the wires are connected.
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1 Answer

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1 Answer

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If you don't have any puppies or strange animals running around your garage I would disconnect the wall control for a couple days. If your problem stops I would suspect that control. If you have a heated garage I would also make sure there is nothing that could be moving from the air movement from the furnace.

Apr 02, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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See if the trolley is jammed against the bolt just in front of the motor unit. If so remove the bolt and then run the opener until the door is closed. While the door is closed locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Remember to replace the bolt.

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1 Answer

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The motor will need rewinding, and the condensor will probably need replacing.
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1 Answer

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Hi there, when the problem first started was the door being used frequently? If your GDO was used quite a few time's in a short period of time the "overload" may have triped. The makers of all GDO's now adays install an overload witch is an electrical safety device protecting the motor. This prevents over heating in turn burning up the motor. To rectify unplug for 15-20 mins. If you have Model number 1270 turn to pg. 7 in owners manuel. Insure all door locks are free. Insure power to electrical outlets by pluging desk lamp in same out as GDO. what model do you have?

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