A tamper is a physical disconnect on the inside of the sensor. This indicates that the cover on the transmitter (larger piece) is not properly seated. Ensure the cover is fully seated on the sensor. If the sensor's cover has been removed, please locate the cover and replace back onto the sensor. Ensure the cover snaps in place.
If the sensor's cover is seated properly and the sensor still reports tamper, please contact Customer Support so we can troubleshoot the tamper issue on your sensor.