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How do I add/delete a one-time User Code on my 275 Contemporary Deadbolt?

How to add a one-time User Code
A one-time user code may be used only once, and then it will be deleted immediately after use.
1. Make sure the lock is unlocked and the door is open.
2. Enter your existing Programming Code.
3. Press enter arrow. You will hear one beep.
4. Press 8.
5. Press enter arrow. You will hear one beep.
6. Enter a new User Code. It must be between 4 and 10 digits.
7. Press enter arrow. You will hear two beeps if successful. If you hear three beeps, it was unsuccessful. Repeat from step 1 slowly.

How to delete individual User Codes
The lock is pre-programmed with a default User Code of 1-2-3-4. It is recommended that you delete this code.
1. Make sure the lock is unlocked and the door is open.
2. Enter your existing Programming Code.
3. Press enter arrow. You will hear one beep.
4. Press 2.
5. Press enter arrow. You will hear one beep.
6. Enter the User Code you wish to delete.
7. Press enter arrow. You will hear two beeps if successful. If you hear three beeps, it was unsuccessful. Repeat from step 1 slowly.
8. Test the code: While your door is open, lock it. Enter the User Code, then press the Lock symbol. The door should not unlock.