Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
Forgot door was manually locked and tried to open; now, the door opens ok but can only be closed from wall switch and then only when switch is held down, riding door all the way down (remote will open but not close door). Releasing the switch before fully closed causes door movement to stop and reverse direction.
sounds like the safety door sensors are at fault,also did you reprogram the remotes by pressing the smart button on the logic board,when the safety sensors are bad the door will reverse to open state.you can pully the rip cord to manualy close the door untill you solve the problem.
Posted on Oct 24, 2007
The motors is cought on something check the motor if it moves inches it will move a yard the question is the motor is it getting power? if so is it stuck on its own drive chain? Check these things you be glad you did.
Posted on May 25, 2009
Sounds like you have a couple problems. First of all press and hold the button on the wall control that has a lock icon for 3 seconds and release. This should take care of the flashing LED and the remotes will now work. Having to hold the button on the wall control until the door is closed is usually a problem with the door sensors. Make sure they are pointed at one another and the small light on each is lit and not flickering.
Posted on Nov 16, 2009
If the main light is flashing 10 times when the door reverses it is a door sensor problem. One may have been bumped so that they no longer point at one another. Make sure the small light on each sensor is lit and not flickering. If this isn't the case you might need to increase the down force a little. The control is on the back panel near where all those white wires go. Increase it about 1/4 turn and try.
Posted on Dec 16, 2009
You have a door sensor problem. The IR sensors found at the bottom of the door rails will need some attention.
Both have an LED visible. Is one on or none? If none are on, check the wiring. Older models had a plug in the rear of the sensor that corroded due to moisture, causing intermittent or no operation.
If 1 is on, check to be sure that they are aligned with each other. If they are crooked, the door will not close without holding the wall button (as you described). They are easily knocked out of alignment.
Check for cobwebs and debris blocking the sensors.
Replacement sensors are around $50 and are easily installed with just wire cutters and pliers. Remember to unplug the unit before replacing the sensors.
Posted on Dec 18, 2010
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