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

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Door wont close unless bi hold the wall button down.

Checked sensors. sending unit light stays lit but receiving sensor light isnt on. tried straight lineing them to check alignment. still now working? do the sensors go bad? is there replacements or a way to jumper past the sensors ?

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Chamberlain troubleshooting


The problem is with the infrared sensor cameras! You must check to see that both cameras have their led lights lit, if not you can position the one that does not have its light on which is called the receiver , The receiver receives a signal from the sending infrared camera and if it is not positioned correctly it will not receive a signal forcing you to hold down the wall station button . The reason for this is a built in security feature letting you know the sensors are not aimed at each other properly ,once you have an indicator light on both sides your opener should work fine and you wont have to stand their holding the button until the door closes ...Hope this helps you , good luck Glenn

Aug 22, 2014 | liftmaster Garage Door 1/2 Hp

1 Answer

I have a Sears craftsman model 139.53637SRT garage door opener. My remote has not worked in a long time. I use the wall control button and have to hold the button in order to open or close the garage door....


It sounds like your door sensors may be bad or misaligned. Make sure the small light on each sensor is lit and not flickering. That could be the cause of your having to hold the wall button down until the door is closed. You can buy a universal remote but if you only had one remote before it could be the receiver that has quit. A new remote would not fix that but the only way to find out is to try.

Aug 15, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

We installed a door opener checked door for binding but cannot get door to close with wall closure or remotes only way it will close is if you hold down the one on the wall, we didnot however install the...


Yes the lack of sensors will stop the operation unless you hold down the button.

Those sensors emit an IR beam that check for objects (like a pet or child) under the door. This is a safety feature to avoid injury or death. If the sensors aren't aligned or the wire connecting either sensor is damaged, the unit will not operate.

Install the sensors, make sure that they are aligned (lit LEDs on both units) and try the remotes again.

I hope this helps.

Cindy Wells

Aug 15, 2011 | Kitchen Ranges

1 Answer

Door will not operate unless you hold down button


I am presuming the following: is it that the door will not operate unless you hold down the button to "close the door"? And the button you are pressing is the hardwired wall button or control inside the garage correct? And if you try to close the garage door with the remote the overhead lights flash off and on or the motor make a clicking sound (about 5 clicks?)
The problem is either an obstruction of the safety sensors at the bottom of the door or, one or both sensor eyes are out of alignment. If you look closely at both safety sensor eyes on the part that faces into the garage, you should see a glowing LED. One side will be an Amber color and the other Green. If one is lit (amber) but the other is not (green), that is an indication that the beam is not being received by the receiving eye (amber).
If there is no obvious obstruction (check for spider webs, dust, try cleaning the clear lenses facing each other, etc,) Try re-aligning the sensors. When they are properly aligned the Green LED will be lit. Now, check the motor for operation.
If you have difficulty getting the transmitter eye (green LED) to light, try closing the door at the wall button, then, pull the red emergency release handle to disengage the door.
Now, try operating the motor unit with the door disconnected while using the hand held transmitter. If the motor unit operates to the close position while the door is closed but not when opened, then that sounds like there is sufficient light entering the garage to "Wash" the transmitter beam out so the receiving eye does not get it.
Contact Chamberlain/Liftmaster for Sensor eye blinder shields that can be easily installed by you. (they just snap on) If neither LED is lit, make sure that the wire to the sensor(s) has not been cut off at the sensor itself. If that checks out, check the connection at the logic board. Make sure that both wires are securely connected.
If after checking all of that, and you do not have either of the LEDs on, then disconnect the safety sensor wires from the motor unit's logic board. Then take a 2" piece of bell wire and jump it across the two terminals for the safety sensors. If the unit operates normally when using the hand held transmitter, then the problem is likely: a) Bad safety sensors b) Broken wire to one or both sensors
To check if the safety sensors are good:
Remove both sensors from their mounting brackets. measure about 8" to 12" of wire from the back of the sensors and cut. You should have about 8 - 12 inches of wire on each. Now, separate and strip the insulation from each and then match the white striped wires and twist them together, and do the same with the solid non-striped wires. Take the sensors up to the motor head and connect the spliced wires to their respective positions on the logic board. Now, Point the two sensors directly at each other (its okay if the clear lens part are touching each other) Check if both LEDS are now lit. 1) If YES; then the sensors are good, the wire to them is broken somewhere; [FIX] replace the wires for both sides. 2) If NO: then the safety sensors need to be replaced. [FIX] Replace the sensors, contact Chamberlain / Liftmaster for replacement parts. You will need your garage door opener's model # which can be found under the light bulb or light fixture on the opposite side of the logic board. Having the model # speeds up the parts search for you.
I hope this helps you out. [I have been factory trained on residential and commercial garage door openers by Chamberlain / Liftmaster and have been providing installation and tech support on them for over five years. Prior to that I used to install and repair these units, and I've done that for nearly seven years.]

May 18, 2011 | Chamberlain & Liftmaster Garage Doors

1 Answer

My craftsman garage door opener will not close. It travels a short distance then reverses, lights flash. All indications are that this is a sensor problem, yet both sensors are lit brightly. The door will...


If the door does not close but only if you hold the button down then yes it probably is a sensor problem. Holding it in bypasses the sensors. Make sure the lights are on(sunlight will make it look like they are lit). Also make sure the surface it is attached to s secure. Watch the sensor as you press the button to make sure it does not shift. If it is not the sensor(s) or the wiring to them, it could also be in the logic board. I would start with the sensors. They are sold in pairs. You can find replacement parts at searspartsdirect.com. Thanks BB

Sep 18, 2010 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

I have a craftsman garage door opener and I have to hold the button down in order to close the door. The door opens fine and the sensors are clear. The unit starts to close then stops, the lights start...


When you can close the door by holding down the wall button it IS the safety eyes or wiring.

If the eyes are mounted to the track. Many times the track wll move as the door closes causing the eyes to move out of alignment.
Watch as the door moves down and see if they need to be adjusted.

If the eyes are not both lit - they are out of alignemnt or have a wiring problem. try adjusting them and see if the lights come on. - if not check the wiring

Hope this helps

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

1 Answer

Myt 1/2 hp craftsmand door opener clicks and light


If the main light flashes 10 times when the door reverses it is a door sensor problem. Each sensor has a small light that needs to be lit and not flickering for them to work. They must be pointed at one another for the lights to be on. Tweak them a bit and see if the lights come on. If not you likely have a bad sensor.

Oct 22, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Our chamberlain garage door works fine unlss its around noon (give or take 2 or 3 hours) with full sunlight. (it faces the south) It won't close with the remote, you have to close it holding the button...


You can try switching the sides the sensors are on. One of the sensors is the sending unit and the other is the receiving unit. It is the sun hitting the receiving unit that causes your type problem. After switching them make sure they are pointed at one another and the small light on each one is lit and not blinking.

Sep 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster 1/2 - Will not close


What usually happens is a sensor gets bumped so that they no longer are pointed at one another. They must be for the light on the second sensor to come on. Tweak them and see if you can get the light to come on. If you can't you either have bad wiring going to that sensor or the sensor itself has quit working.

Jun 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My garage door wont go down.I habe to hold the switch down but if i let it go the door will go up again.


I have a Liftmaster garage door that won't go down unless you press and hold the wall button. The sensor lights are both on. The green light on the unit flashes unless I press the reset button. As soon as you press the wall button it flashes again and the door won't go down unless you hold the button the whole time. The remote wont' make it go down either. It begins to sometimes and retracts, but sometimes the light bulb just flashes (like it is obstructed). I tried replacing the wall switch and that did nothing. Help!

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

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