chexit unlocks door when key used

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Answer
Using the key from the pull side of the door does not retract the latch bolt on a rim or vertical rod chexit device.
CX98/9975 mortise devices will retract the latch bolt when the key is used on the pull side of the door.
The NL key override will not open the door while Chexit rim or vertical rod device is in the arm mode.
When CX99L-BE is not armed with key cylinder on the device or shunted by card reader, the exterior 996LBE lever trim will release.
Panic devices are not design for exterior application. As with any mechanical device, exposure to the elements may affect the operation and life of the device and/or finish and may void&nbs...
Water and electricity do not mix.  Von Duprin electrified devices can NOT be used in an exterior environment.
The keycam may have failed, example here, the latest design keycam can be easily identified as the colored changed to black. Replace either the keycam or chassis as needed to r...
 This could also happen if the tailpiece isn't installed in a KIL, FSIC, or SFIC cylinder.  The FSIC driver also could have come loose from the core in the spindle.
This change was implemented in firmware package CO.A.6 (or later) to help the customer in the communication and coupling process between the CO200 (CO250) and the hand held device (HHD). ...
The green LED is to be lit up until the spindle (Triangles and Key Switch) are aligned properly; providing a visual indication of the problem.  
If the mechanical alignment of the triangles on the back of the outside escutcheon are not aligned, the CO200 or CO250 will not connect with the SUS/HHD and will appear to be unresponsive...
In firmware CO.A.6 (or later) the Schlage button on the CO200 (CO250) will turn green anytime that the spindle triangles on the front escutcheon are out of alignment or the mechanical key switch is...
When unlocking the CO200 door by mechanical key override, the green led will be continuously ON until the key is released. This will occur after firmware CO.A.6 (or later) has been installed int...
Chexit devices are NOT electric latch retraction.  In order for Chexit device to operate with an auto operator you will need to add a rim electric strike on a single door or a pair o...