I would turn on PIN DEBUGGING... And using M42 and M43 see if I can turn on the fan. If the fan isn't wired up to the 'correct' pin, you'll have problems turning it on.
Also... M43 is pretty smart. You can put it in a mode where it tells you what pins changed.
So you can unplug your fan from where ever it is plugged in, and ground that pin.
And M43 should be able to report which pin's status changed.
Also... M43 is pretty smart. You can put it in a mode where it tells you what pins changed.
So you can unplug your fan from where ever it is plugged in, and ground that pin.
And M43 should be able to report which pin's status changed.