Many things can cause this. Bad decoupling capacitors, blown power output transistors, 2sa1941/2sc5198 and associated drivers, bad voltage doubler capacitors, or simply a bad primary power rectifier. It can be fixed but the question becomes... is it worth it??? I have thre of these and all of them have failed at one time or another. I fix my own or I would have just trashed them.... [email protected]
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More than likely you have an internal fault either in the fan itself or the thermostat that activates it.
For a fuse to blow it has to have a lot higher than normal current draw through it, which is normally refered to as a short. If the fuse blows almost immediately then I would suggest you unplug the fan, and see if the fuse blows with just the thermostat in the circuit. If it blows - replace the thermostat control. If it doesn't blow, plug in the fan and watch it. If it trys to start and then blows the fuse, replace the fan motor.