You can use a Smart Switch and Single Pole Smart Dimmer to diagnose wiring issues that prevent non-rocker switches from working properly.

Single pole locations:

1. Verify rocker switch controls the lights properly

2. Install Smart Switch

   -if it powers on as evident by a green LED flash behind the config button, neutral is present

   -if it does not power on, neutral is not connected.

   *note- after resolving the no neutral fault, be sure to test with the Single Pole Smart Dimmer to confirm polarity is correct

3. Install Single Pole Smart Dimmer
   -if it powers on as evident by a green LED flash behind the config button polarity is correct and neutral is connected
   -it does not power on but the Smart Switch did, then the backplate has wiring fault of line/load reversed. This means the line wire is plugged into the load port and the load wire is plugged into the line port, they need to be switched.
   
   Multiway locations:
   1. Verify rocker switches control the lights properly
   2. Remove rocker switch from 1 location only. Rocker switches must be installed in other locations when conducting this test.

   3. Install Smart Switch

      -if it powers on as evident by a green LED flash behind the config button, neutral is present

      -if it does not power on, then the backplate has wiring fault of neutral wire is not connected

   4. Re-install rocker switch, then repeat with other locations