Motion Detector triggering every hour

I have a motion sensor that is triggering motion every hour on the dot when there is no motion. I just installed the system and one out of the 4 motion detectors is triggering motion at exactly one hour increments. This had set off the base station twice. I have disabled the sensor to prevent nusiance alarms. I am not able to troubleshot at this time. I am writing the post as a place holder in the event that I need a replacement motion sensor. I will not be able to troubleshoot the sensor, as I will not be living at the house where it is located at for over a month.