I know this post is kind of dated but,
Try resetting the address.
From the load center at the equipment:
press menu.
press up arrow (scroll) to settings, press select (right arrow)
scroll to address and press the right arrow button.
wait till display says "sending address".
From the hand held unit:
Do the same:
press menu.
press up arrow(scroll) to settings, press select (right arrow)
scroll to address and press the right arrow button to lock on to the unique address that is being sent from the outdoor panel.
wait until display says "found addressed".
press the menu button to save and exit this mode.
Now return to the outdoor panel:
press the menu button 3 times to exit the "sending address" mode.