Why Is My Wireless ADT Motion Sensor Flashing Red?

Your ADT Wireless Motion sensor is flashing red because it was powered on within the last 10 minutes, and it is detecting motion. A motion sensor will flash red whenever motion is detected within the first 10 minutes of power up. This allows the user to test the motion before mounting it.

The flashing red light on a motion detector indicates that the device is in its walk test mode. In this mode, a user can walk around the area and check to make sure that motion is being detected. If the device is not flashing red, then it is not detecting motion, and the position of the sensor will need to be adjusted. A motion sensor will enter this mode on its own immediately after powering on. After 10 minutes, it will exit this mode automatically.

Sometimes a user may need to have their sensor reenter walk test mode for testing purposes. To do this, simply remove the battery for the motion sensor. This will cause the device to power off. Then reapply the battery to power it back on. The sensor will automatically enter walk test mode and remain in the mode for 10 minutes. The sensor can then be tested as needed. If 10 minutes is not long enough, remove the battery and apply it again.

Please note that a motion sensor in walk test mode is still functioning properly. If the sensor is programmed with the panel, it will still send a signal to the system which will then perform the programmed response. This is true even if the sensor is in its walk test mode and flashing red. Setting off a motion in its walk test mode can cause a false alarm if the panel is armed when it occurs. For that reason, always make sure to put a monitored system in test mode prior to testing a motion sensor. This can be done by contacting the central station and having them place your system in test mode.

The video below demonstrates how to perform a walk test using a Honeywell 5800PIR-RES.