This is your first post.
Since we don't know what vehicle you have I will give some general info.

On mine the blower motor was full of crud and the rear bearing which is in my case a bronze bushing was also fill of crud and the Blower motor stopped turning. When the Motor has trouble turning it draws more amperage and that can exceed the amperage of the Fuse and or the Wires if you have the wrong Fuse.

So the Motor itself should be pulled and inspected.

Or you could have a typical short circuit where the insulation of a wire wore through and got ground.

When some motors wear out the brushes the brush springs make contact but that is usually noisy.

Motor and Stator windings can fail on their own often due to vibration but I have not read of that happening.

Depending on the year the Auxiliary Water Pump has no fuse but is connected to the climate control board. When that pump seizes up or has other issues it has been known to burn the control board and once I read it caused a fire in the interior.

__________________
84 300D, 82 Volvo 244Gl Diesel