Here's what a Pentair Rep added to a forum string regarding a similar issue, though I do not understand how a filter cap would affect/improve the circuit's ability to receive discrete power on/off events:
"A filter capacitor has been implemented in early 2013 to resolve this issue is caused by site‐specific electrical noise. If your lights where manufactured before this point, this could very well be what needs to be corrected."
Last edited by Mogul on May 21, 2017 12:53.