Assuming the fuse is for the fan motor, it would have to be a short, or a jammed/seized blower motor to blow the fuse.
I don't know if the use the same shit arrangement that KA and festa etc use with the control valve on the bulkhead(engine side) and a nice very unreliable circuit board and controls, but if they do, I would suspect these, or am I misunderstanding you ?
tabetha