It's hard to tell from the picture so I'm not sure if it is coming from the AP unit or a cable that is going out of the unit. If it's in the cable from the thermostat I would check at the thermostat and see if it is connected.
Just guessing if it could possibly be an antenna for a remote control?
Pat
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Pat - WA3UOE
2011 Carriage Cameo K37KS3
2006 Chevy 3500 Dually (LBZ)
Belleville, PA
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