Michael R Memphis , TN March 18, 2017 Appliance: Frigidaire Washer ATF6700FS2 Frigidaire Washer Atf6700fs2: E90 error code. How to replace Washer Main Control Board. Had been using the hair dryer trick, but after replacing the control panel, it's working fine. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes