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Hi CupertinoCA, if you remove the face plate to make any wiring changes we do recommend turning the power off for your system. If You are removing the face plate to check information from the back, taking a picture of the wiring or reset the Wi-Fi connection you don't need to turn the power off before but we do recommend changing the mode on the thermostat to Off before removing it. If you are not sure about something or need assistance with your device you can contact our tech support team at (800) 468-1502 or on social media. - Maria
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