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

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The power flickers on and off after opening or closing

The door opens then the power to the unit flickers on and off for a couple of minutes and then goes back to showing on and you can then close the door. Happens when door is opened or closed.

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What happens if you plug a lamp into outlet. does it stay lit.

Posted on Jan 15, 2009

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I closed my garage door but when i came back home it was open. i just noticed it again after i left that the door opened by itself after i had closed it? The wall unit is Wayne Dalton model number...


Watch the door when it closes. If it is traveling too far and hits the floor the safety will cause it to reverse to the open position. This is a common cause. Also your door sensors may need adjusting. Make sure they are pointed at one another and the small light on each one is lit and not flickering.

Dec 12, 2010 | Sears Craftsman LiftMaster Chamberlain...

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My mom & I each have a Craftsman garage door opener at our respective homes & live @ 15 minutes apart. Our openers are about 13 to 14 yrs old. The past two yrs. we've both had the same problem. ...


If the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. Make sure both lights on the sensors stay on and don't flicker while the door is moving and the sensors are firmly attached so they don't move. Tweak them just a bit.

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

1 Answer

Craftsman 53918 - 3/4 hp, belt drive garage door opener. Wall unit says safety sensors misaligned. Replaced them as suggested by manual, no fix. Does not appear to be any power from where you plug...


The main light flashing 10 times is the sign of a door sensor problem. Check to see if the small light on each sensors is lit and not flickering. If you cannot get both lights to come on your sensors or the wiring to them is bad.

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

1 Answer

Craftsman 139.53673SRT1 garage door opener (1997 model) worked yesterday. Today the unit is not responding, the light does not flash, the LED blinks 5 times then stops and then starts again. Unit clicks...


Usually when this happens it is because the door is open and the trolley is jammed against the bolt just in front of the motor unit. Try loosening the chain to relieve the pressure on the trolley and then close the door. While the door is closed locate the 'up limit' control on the side of the motor unit and turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Now tighten the chain.

Mar 20, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman Garage Opener intermittently not closing


A couple things to check and do. If the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. Make sure they are pointed at one another and that the small light on each one is lit and not flickering. Tweak them a bit if necessary.

If the main light isn't flashing it may just be a simple adjustment. Locate the 'down force' adjustment on the rear of the motor unit near where all those white wires go. Increase this about 1/4 turn and try.

For the light you should unplug the unit and then using a small screwdriver pull out on the center contact in the light socket.

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

1 Answer

My craftsman139.53644SRT won't close w/remote


You must make sure you followed the color coding of the wiring to the sensors. One wire is solid white and the other is white with a black stripe. Make sure the small light on each sensor is lit and not flickering. If nothing works then you must have a power problem. Make sure it is plugged in.

Jul 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster garage door opener will only work at wall unit


check electric saftey beams. shovel blocking them. dirty. aligned (LED on in each unit)

Jan 12, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Lights flicker and door stops. both up and down.


do you have a duplex outlet that unit is plugged into? Try plugging a lamp into other outlet and see what happens to it when you run door, watch torque settings. they effect safety.

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

4 Answers

Liftmaster garage door intermittent power loss


I had the same problem. Although it appeared to be the logic board, on mine it actually was the connectors between the logic board and the power supply board.
There are 2 connections on the logic board. One white connector with wires going to the main unit, and another set of connectors that plug directly into the smaller circuit board that holds the step-down transformer (120vac - 22vac). These pins were not making good connection between the boards. I simply bent the pins slightly so they would make better contact on the logic board and have not had a problem since. This must be a weak point on these door openers. Purchasing a new logic board would work too, as the connectors are newer and tighter.

Dec 27, 2007 | Sears Craftsman LiftMaster Chamberlain...

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