The red LED blinks once every 5 seconds.

After four incorrect code entries, your lock will enter into Penalty Lockout mode. The Penalty Lockout will last for 15 minutes, during which time your keypad will not accept any input. If you press any key during the lockout period, the keypad will rapidly flash and chirp 8 times. Wait until the lockout period has ended before attempting to re-enter your combination.