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888LM Constantly Beeping - Not Working

I hooked my 888LM to my Liftmaster 7675. I get the slow blinked red and yellow lights as described in the instructions. After about 30 seconds I get three beeps and both lights go out. Then the same process repeats for (as far as I can tell) forever... Red/yellow blinking for 30 seconds, three beeps, everything off. I can't seem to get anything working on the 888LM. When I hook up my previous controller (882LM) it works immediately. What am I doing wrong?
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