Rachelle R Silversprings , MD August 23, 2015 Defrost timer not advancing Replaced timer, 2 screws 1 wire harness. 10 minutes total, needed a stubby philips screw driver, would have been a bit easier with an offset philips screw driver. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes