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Optima G3 Compact Alarm System?

Hi,

On this alarm, I have the Chime set to go off, for my front door, back door and garage - all of which are on the same single input into the alarm circuit board.
It has recently started chiming once (as needed) while the front door is open. When I open the back door or garage door, then the chime goes repeatedly ever 5 seconds until I close the door (it never used to do this). Has anyone got any ideas of how to solve this please. Thanks.
CPH, February 2012
Check the wiring/contacts.

Alarm, February 2012
link Click here to see other fixes for Optima G3.