Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Green senor light blinks on and off. Can only open garage from wall opener . There is no senor blockage.

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WHAT GREEN SENSOR LIGHT ARE YOU REFERING TO.

IF YOU MEAN THE WALL BUTTON LIGHT - THAT WOULD TELL YOU THET THE LOCK BUTTON IS ACTIVATED LOCKING OUT ALL RADIO CONTROLS - PRESS & HOLD THE LOCK BUTTON FOR 3 SECONDS THAT WILL TURN OFF THE LOCK FEATURE - PROBLEM SOLVED.

IF YOU MEAN THE GREEN LIGHT ON THE SAFETY EYE - CHECK THE WIRING IT COULD BE A BROKEN WIRE OR REVERSED POLARITY - ALSO BE SURE THE UNITS ARE PROPERLY AIMED AT EACH OTHER.

HOPE THIS HELPS

Posted on Nov 10, 2010

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1 Answer

The green light on the wall switch is blinking constantly yet it works to open/close the door. The remote does not work. Any suggestions?


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this just happened to us today as well. the wall pad has three buttons: one large back-lit button pad to open it and a lock button and a light button. the open button was blinking quickly and would open the door, but the car remotes did not work. I found that by pushing both the "lock" and "light" button at the same time for about 3 or 4 seconds, the back-lit "open" pad stopped blinking and went to steady green. I went back to the cars and checked the remotes there. both opened the door.

hope this helps someone out there

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