If your Leviton Decora Smart switch fails to turn off the lights, the issue is typically caused by a frozen internal relay, incorrect load wiring, or a software lockup. First, perform a soft power cycle by pulling out the mechanical air-gap switch located at the bottom of the paddle for 5 seconds, then pushing it back in flush. If that fails, shut off the branch circuit breaker for 10 seconds to fully reboot the device. Verification: Listen for an audible click from the internal relay when pressing the paddle and check that the LED status indicator re-illuminates. If the issue persists, inspect the wiring behind the wall box to ensure load and line wires are not reversed.
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