How to Fix a Sensor Malfunction on the Honeywell R-D/W 5818MNL

Summary: The Honeywell R-D/W 5818MNL recessed door/window sensor may experience malfunctions due to low battery, misalignment, or connectivity issues. This guide provides detailed troubleshooting steps to resolve these problems and ensure reliable operation.

Common Causes of Malfunctions

• Low Battery: Depleted power can cause the sensor to fail in sending signals.
• Misalignment: The sensor and magnet must be aligned correctly to detect door/window activity.
• Connectivity Issues: Interference or weak signal strength may prevent the sensor from communicating with the control panel.

Step-by-Step Troubleshooting

1. Check and Replace the Battery:
   1. Remove the sensor from its recessed position by carefully pulling it out of the door or window frame.
   2. Inspect the battery for damage or depletion.
   3. Replace the battery with a CR2 lithium battery, ensuring proper orientation.
   4. Reinsert the sensor into its recessed position and test its functionality by opening and closing the door/window.
2. Verify Sensor and Magnet Alignment:
   1. Ensure the magnet is aligned within 1/2 inch of the sensor when the door/window is closed.
   2. If misaligned, adjust the magnet's position to ensure proper detection.
   3. Test the sensor by opening and closing the door/window.
3. Test Signal Strength:
   1. Open the Brinks Home app and navigate to the sensor's signal strength details.
   2. Verify that the signal strength is above 80%.
   3. If the signal strength is weak, relocate the sensor closer to the panel or consider installing a signal repeater.
4. Check for Interference:
   1. Identify potential sources of interference, such as large metal objects or other wireless devices.
   2. Reposition the sensor or remove the interference source, then test the sensor's functionality.
5. Power Cycle the Sensor:
   1. Remove the battery for at least 2 minutes.
   2. Reinsert the battery and wait for the sensor to reconnect to the control panel.
6. Reset and Reconnect the Sensor:
   1. Remove the sensor from your system via the Brinks Home app or control panel.
   2. Follow the manufacturer's instructions to reset the sensor to factory settings.
   3. Re-add the sensor to your system and test its functionality.

Further Assistance

If these troubleshooting steps do not resolve the issue, contact Brinks Home support for additional help or to schedule a technician visit.