First, replace the battery and try the key pad again. If the keypad is still not responding follow the directions on your instruction sheet for using the trouble key that came with your electronic safe. Once the door is open, reset your code and test your combination with the door open. If your keypad is still unresponsive, please contact Stack-On’s Customer Service department at 847.665.1602 (Monday to Friday 6:00 am – 4:00 pm Pacific).