E5+. Cooling fan (red/black wires) on the hot end doesn’t seem to be working. I noticed No specific event to make this happen. I got a new fan, plugged it into the wiring harness and still no joy. The nozzle fan runs when I turn it on in the software on the screen. I have a bad memory about when the fan would run. I thought it would start whenever a print was started?!? What should I look for? A fuse? Is the motherboard shot? Any ideas?