Extruder fan not really working

I havent been able to get my extruder fan to work much. I’ve gotten it to intermittently turn on in maybe 2 builds when it’s supposed to be on all the time and half of those times it seems to be blowing backwards the other half it was blowing right. I rechecked and it was mounted the same as in the instructions. I try sending M106 S255 and get nothing. I try manually starting it by spinning it myself and that has worked once. I checked all the connections twice and it still doesnt work.

Please help

When you are feeling the fan blowing backwards you’re feeling the backpressure. Try running the fan at low percentages to high percentages to see the range that works well for you, like:

M106 S25

M106 S120

M106 S215