door stuck unlock

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AL-Series and discontinued D Lever-Series locks use castle nuts to hold the chassis to the spring cages and to keep the chassis positioned in the door. This causes confusion at times when the lock ...
Look to see if the  "Fail Safe?UNLOCK" on communication failure is set and you have lost communication.
The "Unlock on READ" from diagnostics will clear with the next AD400 heartbeat, automatically. It will also clear with successful communication to a working access control panel. 
 If the AD-400/AD-401 is LINKED to a PIM400-TD2 and all credentials including invalid cards are granted access, the PIM400-TD2 is not communicating with the Access Control Panel, and the lock is st...
Or force a strike input to the PIM400-TD2. Short J8-1 and J8-2 (Door 1), Short J7-1 and J7-2 (Door 2) on the PIM400-TD2
After installing a classroom deadbolt, there is potential for the thumbturn to project the bolt only, get stuck in one position, or move both directions but not move the bolt.  These are caused fro...
When CX99L-BE is not armed with key cylinder on the device or shunted by card reader, the exterior 996LBE lever trim will release.
There is potential for ND40/ND44's manufactured around March 2011 to remain locked after egress, or after the latch is depressed.  There was an issue with the keycam that created a bind when l...
Check the timing first, Where can I find timing instructions for the Falcon T lock? The keyspindle assembly for the T/RU571 and the T/RU561 was re...
Replace the lock chassis as necessary for any T locks exhibiting this issue.  RU locks need to be replaced entirely.