I have installed a sub panel in an attached garage. 4 wire system from main panel to sub panel. Out of sub panel I have 3 ckts that feed GFIS and they all have recepticles connected to load side. I also have two lighting ckts. The one is for office lighting in one corner of garage. The office has a combo ceiling fan light. Pass and seymour devices. Cuttler hammer Ch breaker panel. When I turn the wall mounted fan speed control down. Going from fast speed to slow speed all three seperate GFIS trip? They do not trip when I increase the speed. Called Pass and Seymour Tech support but he was clueless? Any one have any ideas? I have checked wiring. No crossed neutral and the fan light is not on the same ckt as any of the GFIS. Thanks
