garage door wont open liftmaster 31A5021-D

primetoddJanuary 6, 2014

when pushing the button the door jerks down for a second, then jerks up for a second , and stops. It works fine without it hooked to the motor manually. 1/2 hp chain drive.

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primetodd

I meant 41A5021-D

    Bookmark   January 6, 2014 at 1:52AM
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