To recover from a lost or unknown combination, you will need the six-digit serial number stamped into the lock case below the bolt and on the circuit board located on the inside of the cover (see photographs below). Divide the serial number into three two-digit numbers. This will be your recovery combination. You will also need to make up a new operating combination, as the recovery process requires you to enter a new operating combination. The unknown combination function is activated by pressing the setup module button for one second when the LED next to the unknown code icon is blinking. When this function is selected, the red and yellow LEDs will blink and the lock will beep six times.
2740 Setup Module Unknown Code Recovery
2740 High-Security Lock