is this a brand new alarm?have you the user manual?
it should tell you if you are using the right entry route,
if it is indeed the front door,check there is no beam in the hall,you could have a stuck door contact,that would mean if there is a beam beam in hall,it will be on the entry route,so if the door contact has frozen on
the alarm will trip as soon as you open the front door ,
check door contact
gts, October 2012