Every hour, your alarm system sends a signal (called a roll call) to each sensor to confirm it’s working and reporting properly.

• If a sensor doesn’t respond, the system sends a failure signal to the control panel.

• You’ll then see an alert or “Malfunction” in the Alarm.com app.

Common Causes of Sensor Malfunction

• Dead battery – The most common reason a sensor stops responding.

• Distance from control panel – If the sensor is over ~100 feet away, communication may fail.

• Radio Frequency (RF) interference – Nearby devices or objects can block signals. Examples include:

  • Routers, cordless phones, gaming controllers, video doorbells

  • Large metallic objects (fridges, TVs, etc.)

  • Walls with metal, plaster, concrete, or metal studs

Troubleshooting & Recommendations

1. Replace the sensor battery

   • Make sure the cover is reinstalled securely.

   • If the cover isn’t aligned properly, it will cause a tamper error.

   • For door/window sensors, ensure arrows are aligned and the gap is less than ¼ inch.

2. Run a sensor test

   • This will prompt the system to send another roll call and confirm connectivity.

3. Check for new interference

   • Look for recently added electronics or changes in the environment that could block signals.

4. Replace the sensor if needed

   • If the issue continues after battery replacement and troubleshooting, the sensor may be defective.

Sensor Test Step-by-Step Instructions:

1. Press clock display or swipe down for the settings menu, then press Settings.

2. Press Advanced Settings, then enter the master code.

3. Press System Test, then Sensor Test.

4. Activate all door and window sensors, walk past motion detectors.

5. IQ Panel 4 beeps and displays sensor signal strength, press Back or Home to exit.