You can troubleshoot your CentraLite 3-Series Moisture Control by following these steps
Replace the battery: Remove the sensor cover and take out the battery. Now replace the old battery with a new CR-2. Fit the cover back and test to check whether the sensor is functioning
Factory reset: Remove the sensor cover and take out the battery. Then hold the reset button and insert the battery. Now your sensor is reset, all you have to do is to rejoin the ZigBee network.