So my new house is almost done and I just completed installing 46 wall switches of which 35 are 2477D and 11 are 2477S. When I use the app to check the status of the devices everyone of the lights on 2477D switches flicker just a little. If create a scene the 2477D lights will flicker.
Sounds like the Insteon power line commands maybe getting into the switches and they are flickering. What type of bulbs are being controlled by the 2477D? If they are LED. Are they rated to be on a dimmer?
It does sound like the Insteon power line signals. Are causing the flicker. You are not the first poster to ask about flicker. Though most are from a mix of Insteon and mechanical dimmer switches. With the mechanical ones flickering. Some brand dimmable LEDs have been reported to be susceptible to the power line signals. If you can test one with a different brand and see if anything changes. That may give more data. As suggested I would also say double check the wiring first.
I agree with the other posters. It could be a loose neutral wire or feedback from the bulbs. Insteon also has a blink on traffic feature that may be turned on. You could try to factory reset 1 of the switches that's blinking to see if it goes away. Philips warm glow LEDs don't have this issue with Insteon. You could get 1 of those bulbs and test it with a switch to see if that helps.
You may also try removing one LED bulb and inserting a standard incandescent bulb in its place. If the blinking goes away in that string you have a load issue. Keep in mind every Insteon devices has a required minimum load read the spec sheet. Lastly, there are only two Insteon devices which state they support LED fixtures and they are the ILL and I believe DIN / Ballast modules.
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When I wrote the original post everything was still 60 watt incandescent. I spent a lot of time inspecting wiring and trying to diagnose the issue following the recommendations from Insteon support. No success.
I have one switch set to blink on Insteon traffic and those blinks are in-sync with the flicker.