Liftmaster Garage Door Opener Remote Not Working

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  #1  
Old 12-03-19, 07:08 AM
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Liftmaster Garage Door Opener Remote Not Working

I have a Liftmaster 2000SDR Garage DoorOpener. The door opens and closes fine using the wall buttons. The remote 3 button device does not work. Once in a blue moon it will work but just to open the door. I have tried new battery and obvious stuff (connections). Also I have a question. This opener has an external transformer that is 120VAC primary and 9VAC secondary. What is that 9 volts for? It goes into the garage door unit. This unit does not seem to have a schematic although I think it is code now to have it attached somewhere on the unit. Anybody have suggestions? Oh by the way, I unpaired the remote and repaired it. When I push the remote button a little light blinks on the main unit.
 
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Old 12-03-19, 10:24 AM
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Have you sync the remote with the head unit. While pressing the button on the head unit, also press the remote button at the same time for about 5 sec. Then try the remote.
 
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Old 12-03-19, 02:18 PM
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Yes I have done that. It looks like it is synced. The light flashes when you press the button but nothing happens
 
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Old 12-04-19, 03:35 AM
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There shouldn't be an external transformer, are you sure it's not an external receiver? can you post pics of both the opener and whats attached to it?
 
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