So i just replaced my 3 Carbon Monoxide sensors, System Sensor CO1224T. After i installed them, I after about a week or two, I got a trouble notice. "AlarmRelay Notification: Protection Loop Fault - Zone 0XX". It seems that after I reset the panel, it goes away, but eventually comes back.
The other day, i went through all the wiring to make sure everything was tight. Checked the resistor and it checked out. double checked the way i wired it. Turned everything back on and it was fine for a few weeks. then the code comes back.
As I mentioned earlier, this was a replacement, not a new install. Never had problems with the older sensors.
Does anyone know if there is a way to isolate a problematic sensor? The lights seem normal. The only thing I can think of is that I have a bad wire somewhere in the wall. We have had mice issues and thought one might have eaten through a wire.