Answer Hello Charles, The manufacturers' F15 code is referring to a failed main control. Be aware before replacing that costly part that there is a resettable fuse that could have tripped. This will cause the exact same code to pop up but replacing the main control will not correct the issue if the fuse needs to be reset. It is depriving the board of one leg of 120Vac and the board "thinks" it has a problem so it will set the code. Read More... Answered by AppliancePartsPros.com | Tuesday, February 25, 2014