On my 264 Deadbolt, the Kwikset button flashes red 3 times
There are 5 possible issues:
1. Your door jammed while attempting to lock. You would need to manually re-lock door. If needed, reposition strike.
2. Your door handing code has not been entered.
Enter door handing code and test lock on page 7 here.
3. No User Code programmed, or User Codes are disabled. You need to program at least one User Code, or re-enable User Codes which is on page 8 here.
4. Unsuccessful programming. Attempt programming procedure again.
5. You’ve entered an incorrect User Code entered. Re-enter User Code