Symptoms
- Switch has no power or lights don't turn on at all
- Switch works manually but won't connect to the app
- Lights flicker or buzz after installation
- Switch shows a blinking or error light pattern
Likely causes
- CommonWiring connected to the wrong terminalsLoad, line, neutral, and ground terminals must match the included wiring diagram exactly for the model and switch type (single-pole vs. three-way).
- CommonNo neutral wire present in the boxMany smart switches require a neutral wire to power their electronics; older homes often lack one at the switch box.
- PossibleSwitch not yet paired with the app after installationPhysical wiring being correct doesn't automatically connect the switch to Wi-Fi or a hub; setup still needs to be completed.
- PossibleBreaker not fully on or a loose wire nut connectionAn incompletely restored breaker or a loose connection can cause intermittent or no power.
- Less commonIncompatible fixture load type (e.g., certain LED dimmers)Some switches aren't rated for every bulb type or total wattage, causing erratic behavior.
What to do
- Turn off the breaker for that circuit and confirm no power at the switch box with a non-contact voltage tester before touching any wires.
- Compare your wiring against the manufacturer's exact diagram for your switch type (single-pole vs. three-way).
- Check whether a neutral wire (usually white) is present in the box; if not, you'll need a no-neutral compatible switch or an electrician's help.
- Ensure all wire nut connections are tight and no bare copper is exposed.
- Restore power and complete the app pairing/setup process separately from the physical wiring.
- If lights flicker or buzz, check the bulb type is compatible with the switch, especially for dimmer models.
- Call an electrician if there's no neutral wire and you want a hardwired smart switch rather than a smart bulb alternative.
Tools and parts
- Non-contact voltage tester
- Screwdriver
- Wire strippers
Smart light switch (no-neutral compatible if needed)Search: “smart light switch no neutral wire”
When to call a pro
If there's no neutral wire, the wiring is unfamiliar (like a three-way circuit with unusual colors), or you're not fully comfortable working at the breaker, hire a licensed electrician.
Safety
Use caution
Always turn off the breaker and verify with a voltage tester that the wires are not live before touching them.