Ademco 40 Mystery Zone

Hi, I have an older Ademco Vista-40 panel with a 4208U remote point module (zone expander). The ademco is using zones 1 thru 9, and the zone expander is set to zones 17 thru 24. I am getting a fault on Zone 12. How? Why? Anyone know? Thanks! sub…

September 14, 2023
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