Olichops Posted October 27, 2021 Share Posted October 27, 2021 So I have an annoying issue with only my master bedroom ceiling cans that are controlled by 2 light switches and lumped under one group so they act as a joined pair. With the lights off, when I lose power to the house and power comes back on the damn lights flash briefly and turn off. No Bueno when sleeping! What causes this? Quote Link to comment Share on other sites More sharing options...
msgreenf Posted October 27, 2021 Share Posted October 27, 2021 last on light level in the driver properties? Quote Link to comment Share on other sites More sharing options...
RAV Posted October 27, 2021 Share Posted October 27, 2021 Hypothesis: Probably no neutral at the dimmer and power stealing allows for a brief flow when power returns. Quote Link to comment Share on other sites More sharing options...
South Africa C4 user Posted October 27, 2021 Share Posted October 27, 2021 I had the same issue and ultimately put all bedroom lights on to UPS circuits to avoid the problem! 3 hours ago, RAV said: Hypothesis: Probably no neutral at the dimmer and power stealing allows for a brief flow when power returns. this was definitely not the issue in my case as there was a neutral at the dimmer. Quote Link to comment Share on other sites More sharing options...
tdougray Posted October 27, 2021 Share Posted October 27, 2021 Yep same happens to me after every power cut, just presumed it was the switches start up procedure to initialise. Quote Link to comment Share on other sites More sharing options...
msgreenf Posted October 27, 2021 Share Posted October 27, 2021 There is a setting about restoring last state on power restore Quote Link to comment Share on other sites More sharing options...
Neo1738 Posted October 30, 2021 Share Posted October 30, 2021 On 10/27/2021 at 5:57 PM, msgreenf said: There is a setting about restoring last state on power restore Sounds like if they are sleeping the last power state is off so shouldn't turn on when power comes back. Quote Link to comment Share on other sites More sharing options...
South Africa C4 user Posted October 30, 2021 Share Posted October 30, 2021 1 hour ago, Neo1738 said: Sounds like if they are sleeping the last power state is off so shouldn't turn on when power comes back. Agreed… my dealer (who may be wrong) told me years ago that this is a problem with the dimmer keypads that a small amount of power slips through while the keypad decides whether it should be off or on and that we won’t see the same problem on a circuit with a switch which creates a proper (air blocked) on/off setting. I may have my terminology wrong but I have seen this at both my houses when power cuts and when zigbee updates… battery back up has sorted the power cut problem for me. Quote Link to comment Share on other sites More sharing options...
Gary Leeds UK Posted October 30, 2021 Share Posted October 30, 2021 Just had our downstairs flash a couple of times ~ these are wired to puck dimmers ~ not too switches Quote Link to comment Share on other sites More sharing options...
C4 User Posted October 30, 2021 Share Posted October 30, 2021 I do not have this issue with dimmers or switches. Can’t tell you what the device settings are, but system is on latest firmware. That said, I I have not seen this issue for as far back as I can remember…….at least a few years :). Quote Link to comment Share on other sites More sharing options...
Olichops Posted September 1, 2022 Author Share Posted September 1, 2022 Hey MSgreenf. where is the last state on power restore located? I assume the flashing of the lights comes from the light modules as if I air gap a single switch and restore the power they flash. Could be due to the LED lights and switch combo? Quote Link to comment Share on other sites More sharing options...
Sherwin Lee Posted September 4, 2022 Share Posted September 4, 2022 I also believe it will be the booting where the processing is neither on nor off or doing a hardware test on boot , so during the decision making it flashes. I had the same issues as in South Africa we have load shedding so almost a daily occurrence. Either way I highly doubt a code will overcome a hardware flaw. Quote Link to comment Share on other sites More sharing options...
Olichops Posted September 24, 2022 Author Share Posted September 24, 2022 Blinking Issue is now fixed!!! The Lithonia LED can lights that are on dimmers must be set to a fixed phase mode under "dimmer mode" Don't use the auto detect selection. Mine was set to reverse phase auto detected and I set it to forward phase. No more blinking upon restoring power to a switch! Not all LEDs have this issues as other brands work fine in auto detect. Hope this helps out other with the issue Quote Link to comment Share on other sites More sharing options...
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