View instructions for resolving a sensor malfunction.

View instructions for replacing your sensor's batteries.

Learn how to connect the QS1135-840 Door/Window Sensor to the IQ Panel 2 with this step-by-step guide.

Learn how to fix a QS1135-840 Door/Window Sensor error.

Sensor Malfunction: View instructions for resolving a 2GIG-DW10E-345 Sensor malfunction.

View instructions for replacing your sensor's batteries.

Learn how to connect the 2GIG-DW10E-345 Sensor to the GC2 Panel with this step-by-step guide.

Learn how to fix a sensor tamper error.

IQ Panel 2 - Door Window Sensor Batteries

Replace Batteries - Qolsys Door/Window Sensors

Tamper Error: Learn how to fix a 2GIG Door/Window Sensor cover.

Learn how to fix a sensor tamper error.

Before fixing your sensor's cover, select your panel.

Tamper Error: Learn how to fix a Qolsys QS1135-840 Door/Window Sensor cover.

IQ Panel - Door Window Sensor Batteries

Replace Batteries - Interlogix Door/Window Sensors

Watch our video on how to install a door/window sensor.

Sensor Malfunction: Read about the causes of and solutions for a 2GIG-DW10E-345 Sensor malfunction.

Learn more about sensors originally associated with AT&T Digital Life accounts.

View instructions for replacing your sensor battery.