I have an ademco vista 20 with a 6150 keypad. Have had it for about 3 years. In the middle of the night last night, the alarm sounded for about 15 seconds, then turned off on its own. There was no record of anything happening on the keypad...in fact it still had the red light as if it was armed and ready....And nobody called us from the headquarters. So it's as if nothing happened, but I can't figure out why the alarm sounded.
Anyone heard of this before or have any ideas what may have caused this?
-Steve