Learn how to install or replace a battery in the Visonic MCT-550 SMA water sensor.
Note: This device is no longer for sale as of August 31, 2021.
What you'll need
- Xfinity Home
- MCT-550 SMA water sensor
- A Phillips-head screwdriver
- 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.
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 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 water 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 water sensor.
To install batteries:
- Locate the screw on the top of the sensor.
- The screw head will have an indentation that looks like an X.
- Using a Phillips-head screwdriver, turn the screw counterclockwise until the cover is loose, and then remove the cover from the sensor.
- You will see a single battery slot with positive (+) and negative (-) battery placement indicators.
- 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.
- 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 using your fingertip to gently pull one end of the battery up until is battery is loose. Then, you can pull it free from the slot.
- Insert a CR2 battery into the battery slot, matching the positive (+) end of the battery to the positive (+) placement indicator located in the slot. Then, press the battery into place.
- When the battery is inserted correctly, a red indicator light will light up.
- Slide the two tabs on the bottom of the cover over the slots at the bottom rear of the sensor.
- Then, press and hold the top of the cover against the sensor body.
- Insert the screw back into the slot at the top of the sensor and use a Phillips-head screwdriver to turn the screw clockwise until it's tight.
- 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, Subscriber Portal 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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