If the doors are tied together with chains and rods, you’ll need to find the flat spot, on the door shaft, of the door that is no longer “connected”. line it up with the set screw hole. Use some blue thread locker on the set screw and retighten it.
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To make sure the doors close correctly, loosen up the jam nuts on one of the turn buckles and then turn the turn buckle in or out till the doors close correctly. Then, tighten the jamb nuts. WARNING, when these units get older, the nuts or the turn buckle may not turn freely. WITH THE UNIT OFF AND UNPLUGGED, spray some of your favorite penetrant on them and let them sit over night. Then try again. Spraying ANYTHING with the cover removed and the power on, can cause a fire and may burn you!
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You may have to use both turn buckles to correct the doors. The chains should not have any slack in them when you are finished. And, you should find out whom is slamming the doors closed and take corrective action.