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I have wired 3 sensors to a room controller, everything is working but I noticed the limitation is 2. Would this eventually cause the sensors to fail?

Yes, the sensor could possibly fail.  Please follow the application at the link below.

http://www.cooperindustries.com/content/dam/public/lighting/controls/resources/Application%20Notes/rc_app_note_for_additional_occ_sensor.pdf