If your Emerson Sensi thermostat has lost Wi-Fi connection, begin by restarting your home Wi-Fi router and checking that your 2.4 GHz wireless network is broadcasting active signals. Next, perform a soft power reboot on the thermostat by pulling the display faceplate off its wall base for 10 seconds, then snapping it back on to force a reconnection. If the network settings remain corrupt, use the Sensi mobile app or device menu to clear existing Wi-Fi configurations and re-enter your router password to re-establish pairing. Safety Warning: Handle low-voltage faceplate removal with care. Verification: Confirm that the Wi-Fi signal icon on the thermostat display turns solid and the device status reads online in the mobile app.
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