After the first 3 incorrect entries, the lock will not accept additional entries for 20 seconds. If 3 additional incorrect entries are entered the lock will not accept entries for 5 minutes. This is a security feature we have added to some of our electronic safes as a deterrent for tampering with the lock. In addition, you should check your battery and change it if necessary. Refer to your instruction manual for additional information regarding, Entering Your Security Code. If you are still experiencing difficulties, please contact our Customer Service department at 847.665.1602 (Monday to Friday 6:00 am – 4:00 pm Pacific).