Simon XT—Sensor Malfunction

Every hour, your alarm system sends a signal to all of your sensors to ensure functionality and proper reporting, which is called a "roll call". If a sensor fails to send a response signal, a failure signal will be sent to your control panel and you'll see an alert or Malfunction in the Brinks Home™ App.

Common reasons a sensor will go into failure/malfunction are:

  1. The battery in the sensor is dead.

  2. The sensor is too far from the control panel. If the sensor exceeds 100 feet, then a malfunction may occur.

  3. There is something causing Radio Frequency (RF) interference near that sensor or near the control panel. Common wireless devices that cause interference include the following:

  • Routers, telephones, gaming controllers, doorbells, large metallic objects such as refrigerators or large TVs, plaster walls with metal fiber, metal studs in the wall, or interior concrete walls.


  1. Change the sensor battery.
    • Note: If you change the battery, be sure to securely replace the cover. If the cover is not properly aligned and snug, it will create a tamper error. Additionally, check to make sure the arrows on the sensors are lined up and there is no more than ¼ inch between the two when mounting.

  2. Perform a sensor test to attempt another roll call. See Simon XT panel instructions in the next section.

  3. Survey the area for recent changes, such as new nearby electronics which may be causing interference.

  4. If the problem persists, you may need to replace the sensor as it is defective.

Sensor Test Step-by-Step Instructions:

  1. When you panel is in a disarmed state, press the down arrow to scroll to Sensor Tests, then press OK.
  2. Simon_XT_Disarmed.png Simon_XT_Sensor_Test_1.png

  3. Enter your master code, then press OK.
  4. Enter_Code.png Simon_XT_Sensor_Test_1.png

  5. Open doors and windows, walk by motion detector, or press keyfob button.
  6. Open_Door.jpg Open_Window.jpg Motion_Detector_Test.jpg TX-4014-01_4-Button_Keyfob_Disarm.jpg

    • • Open and close door or window sensors
    • • Press any button on your keyfobs
    • • Walk in front of motion detectors, or trigger manually by removing the cover
    • • Hold the test button on your smoke or heat detectors
    • • Hold the test button on your carbon monoxide detector
    • • Open the cover on any flood or glassbreak detector to trigger the sensor

  7. The Simon XT beeps up to 8 times indicating the signal strength as follows:
    • • 1 to 3 beeps = Poor
    • • 4 to 5 beeps = Marginal
    • • 6 to 8 beeps = Excellent

    Simon_XT_Sensor_Test_2.png Simon_XT_Sensor_Test_6.png

  8. The sensor test ends when all sensors are tested or by pressing Status.
  9. Simon_XT_v1.3_Scroll_Buttons.jpg