I installed a new schlage dbl cyl deadbolt it works until I lock unlock the exterior side of the door then the interior side key turns to the point where it has to push the bolt to lock and it stops.

SOURCE: new schlage deadbolt stuck in locked position

Make sure that the tang from the lock side actually engage the mechanism in other side of the door. If the tang is too short or not engaged the lock will not work. Also check that the two screws connecting the lock to the other side is actually tight.

SOURCE: Single cylinder dead bolt only works with key

You are 180 degreees out of sync with the other side of the bolt. Take it apart and move your key 180 degrees and reassemble and try it. Im 51% sure this is your trouble

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SOURCE: Schlage deadbolt will not unlock even with the use of a key?

it sounds as though the linkage that pulls the deadbolt back has disengaged... if you undo the screws from the inside of the door and remove the manual knob there will be 2 more screws holding the key lock to the door. A thin flat bar is attached to the key lock that goes through the deadbolt and into the manual knob. This bar turns with the key, sliding the bolt on its track to lock and unlock the door. Once the lock is apart check the key in the lock to see if the bar turns when the key does. then see if there is anything that may be obstructing the deadbolt from sliding. The locks are pretty indestructible so if there is a problem it may have been from the install... perhaps the door is to wide for the lock to engage properly and the lock worked loose in the 6 months that it worked.

Testimonial: "I will try your suggetion. Thank you."

SOURCE: exterior key for deadbolt just turns around and around.

From a pro-locksmith: Kwikset uses a clip type retainer to hold their tail piece in place and keep the cylinder plug from coming apart. It sounds to me like the retaining clip has backed out slightly and is not engaged with the tail piece. If it backs out further the entire plug assembly, tumblers and springs will pull/fly out. Its a trip to a locksmith, parts in a baggie. Remove deadbolt, push clip back in and oil area.

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