ADT Water and Temperature Sensor shows the wrong time, state or sensor reading

The checks in more detail

if it is several hours out, the time zone is wrong. A gateway that has been offline can drift, so check its connection and let it update. The status of the sensor, whether dry, wet or in trouble, is shown from its last report, and a sensor that has not reported for a while may show an old status, so check its battery and range as well. A water sensor is only useful if its status is current, so do the checks properly. Look at the last-seen time in the app, replace the battery with the type the manual lists,

and make sure the sensor is within range of the panel or gateway, since basements and utility rooms with thick walls and metal appliances weaken the signal. Test it with a few drops of water on the probes as the manual allows and check that the app reports it and clears afterwards. Check the temperature reading against a thermometer, because a sensor in a cold corner reads colder than the room. Notification times follow the phone's clock too, so set the phone to automatic. If the time stays wrong after you correct the zone and restart the gateway, ask the monitoring company to check the clock on their side.

Keep a note of what you changed and when, and re-test every few months. A stale status is easy to miss, so build a habit: when you test the system each month, look at the last-seen time of the water sensor and any other low-power sensors and confirm each shows today. A sensor that last reported weeks ago is giving no protection, whatever its status icon says. Recording the date of each battery change next to the sensor helps you see when one is overdue. If the sensor is in a basement, a repeater or a move to a higher shelf near a stairwell often brings it back.