I have a fifteen year old Fantastic Vent that worked fine until we set up at our seasonal site. I finally got the nerve to climb on the roof to see if I could see any obvious faults, I couldn't find any. I called Fantastic Vent, spoke to Randy in technical support, he told me to look at the plunger switch and spray some contact cleaner on it, and cycle it a few times. That was the problem! Five minutes of my time and everything works! Thanks to everyone at Fantastic Vent for a great product and great service even fifteen years after the sale!