the stobe output is not programmable so it can only be that the alarm needs reseting or there is a fault on the alarm
the strobe output will only activate if there is a fault or alram is being tesed or has activated when you were out and if all this is not the case and all is as it should be then try down powering the panel mains and battery and reinstate the power put in user code to silence then press reset when the lid is replaced doing this will refresh the panel in case it has had some kind of serge.
Chris AXIS Fire & Security, March 2007