[header] How to fix a front load washer so that it does not smell with washer fan [title] Understand what causes the smell to begin with. [step] It is multiple types of mold (including black mold) growing in the internal drain hose inside your washer where you can't see it. [title] Understand why it grows there. 
[step] Search " mold growth " and you will see that the biggest problem is high humidity (over 60 %). This chart shows you at what relative humidity mold starts to grow.