The FA Jumper (two pin plug with single red wire) is not sold separately.
Without that jumper in place, the board will look for a 900-FA board installed in the 4 pin port nearby to determine if the board will have output power.
If the FA jumper was removed, add a 900-FA board with a single wire connecting the FA1 and FA2 terminals (if output is not required to discontinue during a fire alarm condition) or connect the Fire Alarm system as indicated in Schlage 900-FA Fire Alarm Input Installation Instructions (if output should be discontinued during a fire alarm condition).
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