Sears LiftMaster - Recent Questions, Troubleshooting & Support - Page 2

To have your lights come on automatically when you walk into an open garage you must START with the lights ON. To turn the feature on, turn the lights on manually with the wall switch, then press and hold the LIGHT button for about 10 seconds until the motor unit light bulbs flash.

Now, if the light bulbs are on, manually turn them out and then walk out through the open door. The light bulbs should come on.

To disable this feature, start with the light bulbs OFF and everything else is the same.

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.

Check your home circuit breakers.

From Chamberlain's website:

There are a few different things that can cause this type of problem.

1. Look at the LED light next to the SMART/LEARN button on the motor unit. If you are facing the garage door, the SMART/LEARN button is located on the rear end or right hand side panel of the motor unit. You may need to remove a light lens cover in order to see it. This button is either purple, red/orange, green, yellow, grey, or white in color. If the light is flashing rapidly this means you have a stuck button on one of your remote controls. Take the batteries out of each remote control. When you remove the batteries from the bad remote, the light will stop flashing. This remote needs to be replaced.
2. If one of your neighbor's remote controls is inadvertently programmed into your receiver, your door will open when their remote is activated. If this happens you will need to clear out your receiver and reprogram your remote controls:
   
   1. Press and hold the LEARN button for six seconds, or until you see the small LED light near the button turn itself off.
   2. If the above steps have been followed and the symptoms continue, there may be an electronic short in either the wall control button or the receiver logic board. In this case, remove the wall control wires from terminals one and two (or red and white) on the motor unit. Should the symptoms persist after the wires are removed, replace the receiver logic board. If the symptoms stop with the wall control wires removed from the motor unit, replace the wall control button, and the wires leading to the wall control button.

The Coromaster 2000 does not operate off limit switches. It has a quarter-revolution optical pulse counter. To re-program the open and close limits do the following: Ensure that the door is open at least a couple of feet. Press the reset button once or twice Short out pushbutton and common and hold until close limit and then release. Door should stop at your new close limit. Wait 5 seconds. Short out pushbutton and common and door will open. Hold the short until open limit and then release. Limits should now be set.

garage door keypad code... how do I reset it? I have a craftsman

One possible reason. (RF) Interference from an ultrasonic humidifier. The radio wave created to create the mist will cancel out a garage door opener I learned it the hard way I almost replace two garage door opener's but I turned off humidifier and everything worked in my Internet works better now too. Just passing this tip on hope I helped.

One possible reason. (RF) Interference from an ultrasonic humidifier. The radio wave created to create the mist will cancel out a garage door opener I learned it the hard way I almost replace two garage door opener’s but I turned off humidifier and everything worked in my Internet works better now too. Just passing this tip on hope I helped.

Unplug the opener and remove the bulb. Use a small screwdriver and pull out on the center contact of the light socket. Replace the bulb and plug the opener in.

Pull the logic board and check it for burnt or missing traces on the printed circuit. Thunderstorms love logic boards.

goto http://www.garagedooropenerguide.com/installationmanuals.html

download the pdf for the unit that is closest to what you have, go thru the diagnostics.

Hope this helps

Remove the bulb and try. The bulb or the socket may be radiating a signal. Unplug the opener and pull out on the center contact of the light socket. Try another bulb.

mikey-moore's advice helped me figure out what to do but it's not exactly what I had to do. Manually open the garage door all the way. Then hit the automatic button you normally would use to open and close your garage door. The bracket slides back and locks into place. Hit the automatic button again and the garage door should automatically close.

Try unplugging the opener and removing the bulb. Now pull out on the center contact in the light socket.

Did you inadvertantly hit the "vacation lock" button on the Mounted push button? This will cause the remotes not to work. Try hitting the button again, and then see if the blinking goes to solid green.

Good Luck

the craftman george door opener will not close the light blinks five time. what is that?

If you can not open the door sounds like you might have a broken spring. Call a professional do not try to repair the spring yourself.

Make sure the battery is good.

Try going here and clicking on your specific model. Each models page has instructions included.

http://www.aclickawayremotes.com/Liftmaster/help.html

Remove the eye wiring from the opener entirely and try it that way.