Alan G Altanta , GA March 24, 2017 Appliance: Model GAGGENAU HOOD VENT (E-NR AH600790) Gaggenau hood vent fan switch computer chip died One screwdrivers, five screws, unplugged chip, inserted new chip, returned the five screws to their holes. Done !!!!!!! Maybe three Minutes total. After 16 Years of great service I can not complain that the chip went bad, the hood vent is a great addition to the kitchen. Read More... 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes Tools: Screwdrivers