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

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Sears garage door opener - stopped working. Light is on. sensors click if blocked, but door will not go up and down. when press buttion, only get a mechanical sound 'hnnnnnnnn" for about 4 seconds.

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Sounds like you have a bad start capacitor. If you take the cover off you will find it next to the motor. Sometimes you can see leakage of electrolyte on the end where the wires go. Not always though. It's only job is to get the motor started.

Posted on Jul 16, 2009

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Posted on Jan 02, 2017

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1 Answer

Why does dooropener lights blink when butten is pressed


could be something blocking the sensor . My sensor on the floor on one side was blocked by a spider web holding a leaf in front of it. My door light would flash and door not go up or down. After i cleaned both sides every thing worked ok.

Jul 01, 2016 | Sears Craftsman LiftMaster Chamberlain...

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Chamberlain 1/2 HP garage opener main part 41A5389-1 will not close door. Motor stops about 1 ft into travel on screw. Nothing blocking door - can easily open and close door manually. What to do?


If the main light flashes 10 times you have a door sensor problem. Make sure the small light on each sensor is on and not flashing. Tweak them if necessary. If the main light does not flash then you can try increasing the down force just a bit. This is a control on the side of the motor unit where the small gray antenna hangs. If this doesn't work you probably have a bad IR sensor which is a small printed circuit board just in front of the motor.

May 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door move a foot, then reverses and light flicks


If the main light flashes 10 times when the door reverses it is a door sensor problem. Each of them has a small light that is on when the sensors are properly aligned. Make sure they are on. If not tweak the sensors to align them. If the light still doesn't come on you have either a bad sensor or the wiring going to them.

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

1 Answer

Door goes up when I press the button, but not down


If when you close the door the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Check to make sure the small light on each sensor is lit and not flashing. They must be pointed at one another to work properly.

Jul 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Problem with Garage Door - Stopping and Starting


If the main light is flashing 10 times when the door reverses it is a sensor problem. Make sure the small light on each sensor is lit and not flashing ever so slightly. The sensors must be pointed at one another for both lights to be on.

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

1 Answer

Liftmaster pro 1/2 hp wont shut in one button press


You have a door sensor problem. Either your main light bulb is burned out or you don't have one in your opener. The clicking sound you hear is the relay for the light. Both of the door sensors should have a small light that is lit. Tweak them until they are.

Jun 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

4 Answers

Garage door only works partly


some thing blocking sensor or laser is not in proper alinement

Feb 18, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door sometimes stops during run as if sensor is blocked


wipe off the sensor glass with a isopro rubbing alcohol; it should fix it.

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

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