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Random Alarm have Scantronic 9448+. It has been installed for last 6 years?

I have Scantronic 9448+. It has been installed for last 6 years.
Recently the panel goes into alarm wnen not armed for few seconds and reperets this every 5-10mins. there is no indication on display. Any ideas what could cause this.
Pat Patel, February 2008
This could be a tamper fault, when the alarm goes off will it stop by itself or do you have to enter your code.

Colin, February 2008
link Click here to see other fixes for Scantronic 9448.