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Why is my Honeywell alarm system not powering down?

Alright, folks it turns out that transformer I unplugged was for the doorbell. I’ve looked all over the house and can’t find a second transformer, but for now I believe that merely holding the “off” ...
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Why is my Honeywell alarm system not powering down?

FC indicates communications failure (telephone) AC means it's getting AC power (from a transformer, obviously not that one.) Follow the green and yellow wires on terminals 1&2 that seem to go out ...
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