I notice you do not have anything in the FALSE condition of your 2nd IF
statement to handle dates in G3 exactly equal to TODAY()-2 and TODAY()-3...
the formula reports FALSE for those two dates. Perhaps you meant >= and <=
instead of > and < in both of your IF tests?
Anyway, to do what you want, put this...
IF(G3="","N/A",
in front of your current formula (after the = sign, of course) and put a
closing parenthesis after at the end. Using your posted formula, the above
comments notwithstanding, this is what the formula becomes after doing
that...
=IF(G3="","N/A",IF(G3>TODAY()-2,"OPEN",IF(G3<TODAY()-3,"PAST DUE")))
Rick