A medium path converting unit to reduce electrical stress, an image forming apparatus including the same and a control method thereof. The medium path converting unit to convert a moving path of a print medium can include a guiding member movable to a first position to guide the print medium to a first path and to a second position to guide the print medium to a second path, an actuator to move the guide member from the first position to the second position, an actuator solenoid to drive the actuator, and a locking unit to lock the actuator to allow the guiding member to maintain the second position.