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The door sensors are the same as all the chamberlan / liftmaster / sears units have been using for years, so when I swapped out my Sears for the 3800, I didn't even change the sensors already at the bottom of the door. As for the panel, it is NOT the same as any other - but it does use the same...

You may be having the same kind of problem I had when I installed mine (BTW - this is the BEST, QUIETEST opener I've ever had. I wish we had these when I had my old house with the bedrooms over the garage!) Mine problems were manifested in the inability to consistently lift the door from floor...