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There is no respond from front door sensor?

Alarm system is Optima XM. On the way out the sound of the buzzer does't change when I open the entry door altough the system works fine. If I change the door sensor would be the answer.
Ali, August 2007
Do a walk test on your alarm system, if the door sensor doesn't activate, then replace it.

Pete, August 2007
link Click here to see other fixes for Optima XM.