Learn what to do when you get a Comm Failure Alert for your Xfinity Home Door and Window or Motion Sensor.
What you'll need:
- Xfinity Home Pro Protection or Self Protection
- Access to your touchscreen or the Xfinity Home app if you subscribe to Pro Protection
- Access to the Xfinity app if you subscribe to Self Protection
- Access to your Xfinity Home Sensor
Difficulty
Easy
Determining the problem
When your touchscreen or mobile app displays a Comm Failure Alert for a door/window or motion sensor even after you replaced the batteries, it may indicate that the sensor has stopped working properly and requires troubleshooting.
Did you know? If you just replaced the batteries, the most common reason a sensor stops working is when the tamper switch is accidentally touched while changing batteries.
- Find the LED light on your sensor.
- Door/window: The light is located on the large part of your sensor; the part usually attached to the door or window frame. Find your sensor below.
- Motion: The light is located on the circuit board or near the batteries. Find your sensor below.
- Activate the sensor
- Open the door or window.
- Motion sensors activate when the cover is removed.
- If the light blinks three times, pauses, then continues blinking in the same pattern, the sensor is not working correctly and will need to be serviced. Contact us.
- If the LED does not light, you may need to remove and reinsert or replace the batteries.
Door and sensor light locations
- Leedarson LDHD2AZW
- Sercomm SZ-DWS04
- Sercomm XHS2-SE
- SMC SMCDW01-Z
- SMC SMCDW02-Z
- Tyco XHS2-TY
- UEI XHS2-UE
- Visonic MCT-320 SMA
- Visonic MCT-340 SMA
Leedarson LDHD2AZW
Sercomm XHS2-SE, Tyco XHS2-TY, or UEI XHS2-UE
Sercomm SZ-DWS04
Remove the cover to find the light for this model. Instructions for removing and replacing are included in the battery installation guide.
SMC SMCDW01-Z or SMC SMCDW02-Z
Visonic MCT-320 SMA
Visonic MCT-340 SMA
Motion sensor light locations
- SMC SMCMT01-Z
- SMC SMCMT03-Z
- Visonic CLIP SMA
- Visonic NEXT K85
- XHS1-TY
- XHS1-UE
- UEHM2AZ0/H74470BA00-0004
SMC SMCMT01-Z or SMC SMCMT03-Z
Remove the cover to find the light for these models. Instructions for removing and replacing are included in the SMCMT01-Z and SMC SMCMT03-Z battery installation guides.
Visonic Clip SMA
Remove the cover to find the light for this model. Instructions for removing and replacing are included in the battery installation guide.
Visonic NEXT K85
Remove the cover to find the light for this model. Instructions for removing and replacing are included in the battery installation guide.
XHS1-TY, XHS1-UE, or UEHM2AZ0/H74470BA00-0004
Remove the cover to find the light for this model. Instructions for removing and replacing are included in the battery installation guide.
