Another glitch worth paying attention to! The following occurred at least one other time while setting sensors. Normally after the batteries are positioned and you press the button to select the random code, the green light illuminates once and then after holding it down for a few seconds it will flash several times. I finished the last of the 16 door/window installs this afternoon and one sensor started flashing during the instant I depressed the button. I removed the batteries, waited about a minute and it did it again. I'm wondering if the zone(s) that give me occasional issues have the sensor(s) that did that? At least now I'll be able to monitor this sensor. One other possibility is that for some reason, when the button was depressed, it immediately selected a code that had already been used. The reason I even suspect this is after it did the multiple flashing, I registered it and it registered a zone I have out (3), even though I set the console to register it as zone 14.