@Bski
A comparative test can help pinpoint the issue.
1. Test the switch elsewhere: Install the same switch in a different electrical box and check whether it powers on successfully.
2. Test another switch in the same location: Install a standard (non-smart) switch, or another HS220 if available, in the original box and verify whether it operates normally.
If the problem occurs with a specific switch regardless of location, it’s likely a hardware issue. If multiple switches fail in the same electrical box, you should check the wiring or electrical conditions in that location.
For warranty matters, contact technical support for assistance.