Does your scanner receive other stuff? Have you tried taking it outside? The 162.4 that you hear on your wx radio, is it playing stuff and giving reports for your area?
(1) press the "Channel" soft button under the display window to stop scanning
(2) push the side function key so that the "F" (for function) appears in the upper left corner of the display.... it will only stay in function mode for about 3 seconds.
(3) quickly (while the "F" is still showing) press and hold the "6wx" button.... be sure you hold down on the 6wx button for at least 3 full seconds