I have an Ademco keypad from an ADT installed security system. I long ago dumped ADT. Anyway, it says "13 Check" on the display. The keypad is wired, but the rest of the system is wireless.
I have only 3 door sensors and 2 motion sensors. All 3 doors beep when I open them. The 2 motion detectors red light goes on when I approach. I am not sure what could be causing the "13 - Check". The alarm seems to function just fine otherwise. Any ideas?
Although I added 2 wireless keyfobs to the system myself, but I am otherwise fairly ignorant as to what system I have an details of the setup.