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garage door wont open liftmaster 31A5021-D

Posted by primetodd (My Page) on
Mon, Jan 6, 14 at 1:45

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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RE: garage door wont open liftmaster 31A5021-D

I meant 41A5021-D

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