Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Door opner stops/appears to lose power

Intermittent problem with Chamberlain WD832KD Garage door opener. Activation from wall or unit will cause door to start to rise, but it will stop 1 to 10 inches from the floor. When it does so, the lights on the unit and on the wall switch will turn off and unit is unresponsive (as though the power is off). When lights go back on (5 to 30 seconds later), unit opens the door.

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How old is your unit. I need to know this it sounds like a Circuit Board problem. but would have to know how old your unit is.

Posted on Jun 11, 2009

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Posted on Jan 02, 2017

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1 Answer

I have a Chamberlain Whisper Drive Security + model HD900D that is opening by itself awhile after the door has fully closed & I've gone into the house, sometimes its hours after the door fully closes....


If the door hits the floor too hard the safety will reverse it to the open position. This can be an intermittent situation. A bad wall control or the wiring to it will also cause this problem. To eliminate them you can remove the wire from terminal #1 on the rear of the motor unit. A staple in the wire can cut through the insulation.

Jan 01, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opens whenever it wants to


In most cases, when a garage door opens or closes by itself, or when you find your door open, up returning home, the problem is due to a short somewhere. This short is most likely to be in one of two places: either in one of your transmitters or in the wall button or its wiring.

When there is a short in your garage door transmitter, you will often find the garage door is up upon returning home, even though you know you closed the door when you left the house. A short in your transmitter causes ta continuous signal to be sent. As you are pulling out of the driveway the garage door closes fully and appears to stop, but as the carriage and arm run past the down limit and hits the header bracket it reverses and the door begins to open, just as you start driving off down the road. You come home to find the garage door is up, as if someone else had opened your door. The best thing to do to troubleshoot the garage door problem is remove the batteries from your transmitters and try operating the door from the wall button. If the problem is intermittent, you may want to do this for a day or two to eliminate the transmitters as the culprit.

If the problem persists, try removing the wall button wire at the motor head to ensure it is not a short in the wire to the button, then try operating the garage door with the transmitters only. If it stops the problem, replace the wires and test the wall button which can also go bad. It is a process of elimination.

Oct 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door 1/2 hp opens. Keeps open for no apparent reason. In the middle of the night and sometimes during the day, How can I fix


Most commonly this is caused by a bad wall control or the wiring going to it. The wall control goes bad from constant use and the problem with the wiring is caused by the staples most installers use. The staples cut through the insulation and cause intermittent shorts. I would remove the wall control and check it for a few days and if it happens again you can remove the wire going to terminal #1 on your motor unit. That will eliminate the wiring. Be sure to remember where the wires go on the back of the wall control as they are color coded. One is solid white and the other is white with a red stripe.

Aug 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Access Master Garage Door Opener opens by itself


The most common cause of this is a bad wall control or the wiring going to it. The wall control goes bad from use and the wiring sometimes has intermittent short caused by the staples the installer used.

Jul 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I can get the door opner to porgram? on a chamberlain md 1245r


On the rear of the motor unit just to the left of all those white wires you will find the smart/learn button. Press and hold the button on your remote and then press and immediately release the smart/learn button. Do this for each of your remotes.

Jul 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My 1/2 hp Chamberlain garage door stops while going down even when I am holding the wall unit. If I stop it and restart it goes a little further and then stops. Both sensors have green lights and they are...


On the back of the motor unit you will find the down force control. You may have to remove a light lens depending on your model. Increase this a 1/4 turn and try.

May 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Liftmaster pro garage door opener opens randomly


CHECK FOR REMOTE CONTROL DAMAGED OR WALL CONTROL SHORTED WIRE

Apr 22, 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...

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