You may be installing the wrong fuse. Here is the service manuel on you car: https://www.subaru.com/content/downloads/pdf/manuals/2010_LEG_OBK_Manual.pdf
The Fuse chapter starts in Part 11 page 48.
The fuse chart is on the inside of the fuse cover. This is for the interior.
The Fuse box on the inside of the engine compartment is located in Part 12 page 8.
There are two 15 amp fuses that control the Blower Fan. Slots 26 & 27.
Try replacing both of these.