Hi, this didnt help too. I have switched all 3 pwms to thermal cruise, so that they lowered the pwm entry every few seconds. None of the fans has reacted. Did you run an ehf chip too? Torsten -- "Ein Herz f?r Kinder" - Ihre Spende hilft! Aktion: www.deutschlandsegelt.de Unser Dankesch?n: Ihr Name auf dem Segel der 1. deutschen America's Cup-Yacht!