What factors may cause the safe box not open

The first to open the household safe box, there are several possible:
1, the step is correct, but the green light flashes red light, which is because the battery is no electricity, or under voltage. This situation can be charged or emergency key to open the safe deposit box.
2, can enter the password, and correct, but the box door is not open.
3, open the door in the process of operation, did not hear the sound of the suction motor, only the flashing yellow light. This situation requires a professional maintenance personnel to check.
So whether it is household safe box or financial cabinet, once the safe deposit box can not open, we need to know what is the case, that can more convenient to solve the problem.