OK here's what it does.
it goes all the way down, sits there for a second then opens again.
It's a "Liftmaster" 1/2 HP motor. Checked the sensors and they seem to
be clear and operational.
Any ideas? Thanks much
Should be an adjustment for the 'down limit' on it somewhere, try
easing it. I had that problem, traced to slight swell in the ground
lifting the slab a bit. Mine, though, did not have a perceptible
pause before it reversed.
Is it properly balanced? Maybe the spring is trying to open it up when the
opener is making the door go down.
Disconnect teh door from the opener and pull it down to the halfway point.
Let go. If it stays there, it's properly balanced; if not, call the garage
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