Have the panel in the house and added a run to a detached garage with a NX216 expander and keypad for that building on a separate partition. It is working but sometimes I get a fire zone trouble fault with beeping and the fire LED flashing when I disarm. I can clear it and it's good for a while. The house has 4 wire smokes so the system is set for 4 wire. The detached garage has 2 wire temp sensor type sensors (just switches based on temp - NOT a 2 wire smoke). I wired them with a 3.3k ohm resistor as would be done with a 4 wire system and connected them between the zone input and common as for 4 wire rather than the 2 wire connection and resistor way. I just double checked all that. I only found 1 location to set the fire to 2 or 4 wire so did the wiring as 4 wire but suspect that may be why I am getting zone faults on the expansion partition. Any ideas on how to troubleshoot this or how to resolve?
Last edited: