8550W lights turning themselves on?

Bryan, thanks for the info. I suspect the issue is with the motion detector. A simple test would be to turn off the motion detection functionality of the control panel and see what happens. If the lights come on it's most likely a problem with the opener/control panel. If the problem does not come back, you might want to consider repositioning the control panel.

The motion detector uses a passive infra-red system which means that it detects differences in heat as motion. If the motion detects the difference in heat, the light will come on. Possible heat sources can include a water heater, wood stove, or other heat source. 
- Chuck

Thank you for the quick response.  The motion sensors are both set to auto-off in 5 minutes and that still seems to work when the motion detector is triggered.  So wouldn't a motion detector fault that caused the lights to turn on still turn the lights back off after a short time?  The control panels are mounted side by side and all but one time there was only one unit (the one most used as it happens) that has been doing this.  There are no heat sources in or near the garage to account for this, so repositioning makes little sense.  Two years of functionality (and mostly only one of the two having this issue) suggests there is nothing wrong with the control panel(s) location.  There have been no other instances of this since I initially wrote, but if it continues I will try turning off the motion sensing as you suggest.  Since it's pretty much summer now the motion controlled part of the lights is less important so makes it a good time for such a test.  Thanks again for your quick response.

Bryan

Bryan, happy to help. Please feel free to send me another note if the issue persists. Chuck

I see that someone has recently had a similar issue, so I will share what I have learned since my original post.  We are in the habit of turning the garage door light off manually when getting home, the door's switch is mounted beside the entry door to our house.  I found that if the motion sensor is triggered while turning off the light there is a delay (can be up to nearly a minute) before it turns the light back on.  Why then it stays on I have no idea, but now that we make a point of reaching for the light switch from below so as to not trigger the motion sensor the problem has nor recurred.
Hope this info is helpful.