I have a home Ademco Vista 20P security system. It is 4 1/2 years olds and has worked fine until now. On the disaplay panel it has a zone number, 10, and "bat" flashing. The zone number refers to an entry door that is hard wired. I thought the system back up battery was probably going bad and replaced it. This did not solve the problem. What is strange is this entry door alarms when I have system in "away" or "chime" mode but not when it is in "stay" mode. As I said it is hard wired so I find it stargne "bat" is showing up in the display panel. Any idea what is causing this and what needs to be done to correct the problme?
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