I removed the power and batteries. Isnt the alarm supposed to go off when you open that door? It didn't. I also notice that every time I open a sensor cover, it doesnt alarm, but it does say Tamper Zone 1 or whatever, but it never alarms. Once I reset it, it seems to work a little better. Still, a door or window that has been a top performer with NO probs, now is not checking in. sometimes doors or windows will not chime until you shut/open about 5 times consecutively. weird.