This doesn't sm to ring true.
2016 is two years ago, and te alarm system has been used for two years?
you had it serviced when?
the alarm going off as you come through the door and no entry tone, sounds like door is programmed as guard or a pir programed as guard picks you up as you walk through the door, now at a service that shouldn't have been changed.
@Handymanjo, most likely as that's the last time someone went in?
2016 is two years ago, and te alarm system has been used for two years?
you had it serviced when?
the alarm going off as you come through the door and no entry tone, sounds like door is programmed as guard or a pir programed as guard picks you up as you walk through the door, now at a service that shouldn't have been changed.
@Handymanjo, most likely as that's the last time someone went in?