Home Security Systems
Home Security System Repair Questions? Ask a Technician.
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If you have the 'code' for the alarm system, enter that code on the central keypad for the alarm system.
If you don't... you may have no alternative but to disconnect the alarm altogether. That is done by getting into it, unhooking the battery, and cutting all the wires that lead to the alarm system box - depriving it of power, thus completely disabling it.
Note: disconnect the phone line from it, first! or it will dial a number to inform (some authority of other) of tampering or other alteration of the alarm system.