Why Does My Smart Light Switch Not Work After Installation?
A smart light switch usually doesn’t work right after installation because of wiring or compatibility issues, most often a missing neutral wire or swapped line/load connections. The next most common cause is incorrect setup on a 3‑way circuit or a tripped breaker that cut power to the lighting leg. In many older homes around the Oviedo area, the wall box may not include a neutral, which many smart switches require to power their electronics.
Try these quick checks in order:
- Confirm a neutral wire is present and properly landed; many smart switches won’t power up without it.
- Identify line vs load with a non‑contact tester, then move any reversed wires to the correct terminals.
- For 3‑way setups, follow the manufacturer’s diagram and use the required companion switch.
- Reset any tripped breaker or GFCI, and verify the bulb type meets the switch’s minimum load.
- If the switch LED glows but the light stays off, line and load are likely swapped.
If you smell burning, see arcing, or the breaker keeps tripping, stop and call a licensed electrician.
Updated: 2026-06-18
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