Learn how to install or replace a battery in the SMC SMCDW02-Z Door/Window Sensor.
What you'll need
- Xfinity Home
- SMC SMCDW02-Z Door/Window Sensor
- One CR2 battery
- Double-sided tape (optional)
Difficulty
Medium
Do you need a battery?
Make sure you have batteries before you proceed. Visit your nearest retail store that sells batteries or click the button below to order your replacement battery kit.
Call us at 1-800-XFINITY if you receive a low battery alert within 30 days of device installation.
How to install the battery
Before proceeding, make sure that your system is disarmed. Working on devices while the system is armed can generate false alarms.
Did you know? You may want to have some double-sided tape on hand if you need to remove your Sensor from the wall to install a battery. Use the tape to reattach your Sensor if its existing adhesive fails to hold it in place.
Help protect our environment: Please properly recycle your discarded batteries. For your convenience, batteries are accepted for recycling at various locations. Check www.call2recycle.org or call 1-800-8-Battery (1-800-8-228-8379) to find a recycling location near you.
Is this your sensor? Make sure that your Sensor looks like the one in the image below. If it does, you're in the right place to find out how to install a battery in your Sensor.
- Locate the small tab on the bottom of the Sensor.
Where's the Tab? If you don't see the tab, make sure to check the top and bottom of the Sensor. The tab location is dependent on the positioning of the Sensor during installation. - Press the tab down using the index finger of one hand while pulling the cover away from the Sensor body using your other hand. After removing the cover you may receive a tamper alert from your system. The tamper alert warns you when the cover of your device is open and will clear once the battery is replaced and the cover is reattached.
Did You See? There is a mark located to the side of the Sensor (see arrow above) that shows the recommended side to use when matching up the Sensor with the magnet. The same mark is found on the magnet for easy alignment.
Be sure not to press down on the tamper (blue square) when inserting the battery as this will reset the Sensor to the factory settings.
Take a Look. If a battery is already present, remove it by gently pulling the end of the ribbon up until the battery is loose and you can pull it free from the battery slot. - Insert a CR2 battery on top of the ribbon in the battery compartment, with the negative (-) end of the battery touching the spring at the top of the slot and the positive (+) end against the green circuit board. Make sure any excess ribbon is tucked along the side of the battery.
- Align the tab at the top of the cover with the thin slot at the top of the Sensor's body.
- Gently push the tab on the opposite side of the cover into the Sensor's body until it snaps into place.
- When the battery is inserted correctly and the cover is reattached, the green light on the front of the Sensor will light up.
- If you're replacing the battery, confirm that the low battery alert has resolved and the Sensor appears on your list of connected devices in your touchscreen or the Xfinity Home app.
- Test the Sensor to confirm that it is working correctly.
Additional information
Visit our Online Support Center to find common solutions.
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