I “inherited” a 2gig system when I bought my house and was told by the prior owner that the system is default coded, i.e., 1111 for the user code and 1561 for the installer code. In the process of verifying the operations of the alarm system, I triggered the alarm and the default code of 1111 and the 1561 did not disarm the system. I now took a short cut to “disable” the alarm by disconnecting all their power, including the backup battery. The worst thing is that a patrol guard showed up at my door ~ 20 mins later after the alarm went off. It is apparent that the prior owner somehow did not cancel the monitoring service yet, for whatever reasons.
Thru my research, it appears that if I re-connect the power, the system will go back to the armed mode. I also learned that we may be able to disarm the system by doing a hard reset to force the 2gig system back to factory settings, i.e., back to the 1111 or 1561 codes. Any recommendations to safely disarm the system without a guard showing up at my door again will be greatly appreciated!