Using a Rumba cloned main board running on 12 volts with Marlin. Installed 12V cooling fan but it will not run from the PWM pins. Runs when connected directly to 12V such as from power supply or any any spare 12v pins but will not turn on when connected to the PWM controlled pins. I measure roughly 12v on the PWM pins when speed is set to 255 and measure no voltage when speed is set to 0. So i kow both fan and board are good.
Using this fan - [
www.ebay.com] .
Havent found any info about this particular problem from scouring the net. Anybody run into this problem before?