Assuming you have an ICON Controller, what is fire Service adjustment F16 set at?? If you are not in a state where there is some farout code deviation,IE Detroit, New York LA,etc., then it should be set at 13. The last number in the manual is 12, but there is a 13 and it is ANSI A17.1 2012 edition I think. You could also add a relay in the car station that is picked up when you go to hold and use NC contacts to open common to the door close buttons.
0=No Fire Service
1=Ansi-1993
2=Chicago Building Code
3=California
4=New York City RS18-1
5=Massachusetts
6=ANSI 1988
7=Houston
8=Michigan
9=B44
10=White Plains, NY
11=ANSI 2000
12=B44-2000